a 的英语意思
aa /ə; strong eɪ/ (also an) indefinite article, determiner 
查看全部语言翻译1used to show that you are talking about someone or something that has not been mentioned before, or that your listener does not know about用于指之前未提及或听话者不熟悉的人或事物: 
We have a problem.我们有个问题。 There was a hole in the fence.篱笆上有个洞。 Suddenly they heard a loud bang.他们突然听到一声巨响。 → the12used to show that you are referring to a general type of person or thing and not a specific person or thing用于泛指某类人或事物，而非特指某个具体的人或事物: Would you like a sandwich?你想要个三明治吗？ I want to train to be an engineer.我想接受培训成为一名工程师。 He’s a really nice man.他真的是个好人。 Take a look at this.看看这个。 It needs a good clean.它需要好好清洗一下。3used before someone’s family name to show that they belong to that family用于某人的姓氏前，表示其属于该家族: One of his daughters had married a Rothschild.他的一个女儿嫁给了Rothschild家族的人。4one一（个）: a thousand pounds一千英镑 a dozen eggs一打鸡蛋 You’ll have to wait an hour or two.你得等一两个小时。5used in some phrases that say how much of something there is用于某些表示数量的短语中: There were a lot of people at the party.派对上有很多人。 A few weeks from now I’ll be in Venice.再过几周我就会在威尼斯了。 You have caused a great deal of trouble.你惹了很多麻烦。6used to mean ‘each’ when stating prices, rates, or speeds用于表示价格、比率或速度时，意为"每": I get paid once a month.我每月领一次薪水。 The eggs cost $2 a dozen.鸡蛋每打两美元。7used before singular nouns to mean all things of a particular type用于单数名词前，表示某类事物的总称: A square has four sides (=all squares have four sides).正方形有四条边（即所有正方形都有四条边）。 A child needs love and affection.孩子需要爱与关怀。8used once before two nouns that are mentioned together very often用于经常成对出现的两个名词之前，只用一个冠词: I’ll fetch you a cup and saucer.我去给你拿杯子和茶碟。 Does everyone have a knife and fork?大家都有刀和叉吗？9used before the -ing forms of verbs when they are used as nouns referring to an action, event, or sound用于动词的 -ing 形式前，当其作名词使用，指代某个动作、事件或声音: There was a beating of wings overhead.头顶上传来翅膀扑打的声音。 Bernice became aware of a humming that seemed to come from all around her.Bernice 意识到四周传来一阵嗡嗡声。10used before nouns that are usually uncountable when other information about the quality, feeling etc is added by an adjective, phrase, or clause用于通常不可数的名词前，当形容词、短语或从句对其特质、感受等作进一步说明时: Candidates must have a good knowledge of chemistry.候选人必须具备扎实的化学知识。11used before the name of a substance, food etc to refer to a particular type of it用于某种物质、食物等名称前，指其某一特定种类: Use a good cheese to make the sauce.用一种优质奶酪来制作这款酱汁。 plants that grow well in a moist soil在湿润土壤中生长良好的植物12used before the name of a drink to refer to a cup or glass of that drink用于饮料名称前，指一杯该饮料: Can I get you a coffee?我能给你来杯咖啡吗？ Renwick went to the bar and ordered a beer.Renwick 去了吧台，点了一杯啤酒。13used before the name of a famous artist to refer to a painting by that artist用于著名艺术家的名字前，指该艺术家的某幅画作: an early Rembrandt伦勃朗的一幅早期画作14used before a name to mean someone or something that has the same qualities as that person or thing用于名字前，表示某人或某物具有与该人或物相同的特质: She was hailed as a new Marilyn Monroe.她被誉为新一代Marilyn Monroe。15used before someone’s name when you do not know who they are用于某人名字前，表示说话者不知道此人是谁: There is a Mr Tom Wilkins on the phone.电话里有位叫 Tom Wilkins 的先生找你。16used before the names of days, months, seasons, and events in the year to refer to a particular one用于星期、月份、季节及年中节日活动名称前，指特定的某一天、某月、某季节或某次活动: We arrived in England on a cold wet Sunday in 1963.1963年一个寒冷潮湿的星期天，我们抵达了英格兰。 I can’t remember a Christmas like it.我不记得有哪个圣诞节像这样。USAGE: A, an用法：A，an• Before a word beginning with a vowel sound, use an:· an elephant· an umbrella· an obvious mistake• 在以元音音素开头的单词前，用 an：· an elephant（一头大象）· an umbrella（一把雨伞）· an obvious mistake（一个明显的错误）• Use an before an 'h' that is not pronounced:· an hour later· an honest explanation• 在不发音的 h 前用 an：· an hour later（一小时后）· an honest explanation（一个诚实的解释）• Use a before a 'u' that is pronounced like 'you':· a university· a unique opportunity• 在发音类似"you"的 u 前用 a：· a university（一所大学）· a unique opportunity（一个独特的机会）• Use an before an abbreviation that is pronounced with a vowel sound at the start:· an SOS call· an MP3 file• 在首字母发元音音素的缩写词前用 an：· an SOS call（一次求救呼叫）· an MP3 file（一个 MP3 文件）
查看全部语言翻译1used to show that you are talking about someone or something that has not been mentioned before, or that your listener does not know about用于指之前未提及或听话者不熟悉的人或事物: We have a problem.我们有个问题。 There was a hole in the fence.篱笆上有个洞。 Suddenly they heard a loud bang.他们突然听到一声巨响。 → the12used to show that you are referring to a general type of person or thing and not a specific person or thing用于泛指某类人或事物，而非特指某个具体的人或事物: Would you like a sandwich?你想要个三明治吗？ I want to train to be an engineer.我想接受培训成为一名工程师。 He’s a really nice man.他真的是个好人。 Take a look at this.看看这个。 It needs a good clean.它需要好好清洗一下。3used before someone’s family name to show that they belong to that family用于某人的姓氏前，表示其属于该家族: One of his daughters had married a Rothschild.他的一个女儿嫁给了Rothschild家族的人。4one一（个）: a thousand pounds一千英镑 a dozen eggs一打鸡蛋 You’ll have to wait an hour or two.你得等一两个小时。5used in some phrases that say how much of something there is用于某些表示数量的短语中: There were a lot of people at the party.派对上有很多人。 A few weeks from now I’ll be in Venice.再过几周我就会在威尼斯了。 You have caused a great deal of trouble.你惹了很多麻烦。6used to mean ‘each’ when stating prices, rates, or speeds用于表示价格、比率或速度时，意为"每": I get paid once a month.我每月领一次薪水。 The eggs cost $2 a dozen.鸡蛋每打两美元。7used before singular nouns to mean all things of a particular type用于单数名词前，表示某类事物的总称: A square has four sides (=all squares have four sides).正方形有四条边（即所有正方形都有四条边）。 A child needs love and affection.孩子需要爱与关怀。8used once before two nouns that are mentioned together very often用于经常成对出现的两个名词之前，只用一个冠词: I’ll fetch you a cup and saucer.我去给你拿杯子和茶碟。 Does everyone have a knife and fork?大家都有刀和叉吗？9used before the -ing forms of verbs when they are used as nouns referring to an action, event, or sound用于动词的 -ing 形式前，当其作名词使用，指代某个动作、事件或声音: There was a beating of wings overhead.头顶上传来翅膀扑打的声音。 Bernice became aware of a humming that seemed to come from all around her.Bernice 意识到四周传来一阵嗡嗡声。10used before nouns that are usually uncountable when other information about the quality, feeling etc is added by an adjective, phrase, or clause用于通常不可数的名词前，当形容词、短语或从句对其特质、感受等作进一步说明时: Candidates must have a good knowledge of chemistry.候选人必须具备扎实的化学知识。11used before the name of a substance, food etc to refer to a particular type of it用于某种物质、食物等名称前，指其某一特定种类: Use a good cheese to make the sauce.用一种优质奶酪来制作这款酱汁。 plants that grow well in a moist soil在湿润土壤中生长良好的植物12used before the name of a drink to refer to a cup or glass of that drink用于饮料名称前，指一杯该饮料: Can I get you a coffee?我能给你来杯咖啡吗？ Renwick went to the bar and ordered a beer.Renwick 去了吧台，点了一杯啤酒。13used before the name of a famous artist to refer to a painting by that artist用于著名艺术家的名字前，指该艺术家的某幅画作: an early Rembrandt伦勃朗的一幅早期画作14used before a name to mean someone or something that has the same qualities as that person or thing用于名字前，表示某人或某物具有与该人或物相同的特质: She was hailed as a new Marilyn Monroe.她被誉为新一代Marilyn Monroe。15used before someone’s name when you do not know who they are用于某人名字前，表示说话者不知道此人是谁: There is a Mr Tom Wilkins on the phone.电话里有位叫 Tom Wilkins 的先生找你。16used before the names of days, months, seasons, and events in the year to refer to a particular one用于星期、月份、季节及年中节日活动名称前，指特定的某一天、某月、某季节或某次活动: We arrived in England on a cold wet Sunday in 1963.1963年一个寒冷潮湿的星期天，我们抵达了英格兰。 I can’t remember a Christmas like it.我不记得有哪个圣诞节像这样。USAGE: A, an用法：A，an• Before a word beginning with a vowel sound, use an:· an elephant· an umbrella· an obvious mistake• 在以元音音素开头的单词前，用 an：· an elephant（一头大象）· an umbrella（一把雨伞）· an obvious mistake（一个明显的错误）• Use an before an 'h' that is not pronounced:· an hour later· an honest explanation• 在不发音的 h 前用 an：· an hour later（一小时后）· an honest explanation（一个诚实的解释）• Use a before a 'u' that is pronounced like 'you':· a university· a unique opportunity• 在发音类似"you"的 u 前用 a：· a university（一所大学）· a unique opportunity（一个独特的机会）• Use an before an abbreviation that is pronounced with a vowel sound at the start:· an SOS call· an MP3 file• 在首字母发元音音素的缩写词前用 an：· an SOS call（一次求救呼叫）· an MP3 file（一个 MP3 文件）