时间: 2025-04-26 12:46:35
美: [ə; e]
英: [ə; eɪ]
art. 一；任一；每一
最后更新时间:2025-04-26 12:46:35
词源分析：字母 "A" 源自拉丁字母表，其根源可追溯至腓尼基字母 "Aleph"，意为牛，象征着力量和领导。
历史背景：字母"A"的首次使用可追溯到公元前1500年的腓尼基文字，后来通过希腊字母传入罗马字母。
课本：
正式与非正式语境：
特殊场合：在科学领域，"A" 常常作为单位符号（如安培）或表示某种特定的变量（如温度中的A表示安培温度）。
He scored an A on his final exam.
（他在期末考试中得了A。）
She is an A student in her class.
（她在班上是一个A级学生。）
The letter A is the first letter of the alphabet.
（字母A是字母表的第一个字母。）
An A rating indicates excellent quality.
（A级评级表示优秀的质量。）
For this project, I aim to achieve an A.
（对于这个项目，我的目标是获得A。）
同义词：
反义词：
采用音标记忆法：
通过以上分析，可以全面理解字母"A"的多重含义和用法。
[DET] You use a or an when you are referring to someone or something for the first time or when people may not know which particular person or thing you are talking about. (用于首次提及或泛指某人或某物) 一 (个)
例：A waiter entered with a tray bearing a glass and a bottle of whisky.一名服务员端着一个放有一只玻璃杯和一瓶威士忌酒的托盘进来了。
例：He started eating an apple.他开始吃苹果。
[DET] You use a or an when you are referring to any person or thing of a particular type and do not want to be specific. 用于指一类人或物，不需要特指
例：I suggest you leave it to an expert.我建议你把它留给专家来处理。
例：Bring a sleeping bag.带个睡袋来。
[DET] You use a or an in front of an uncount noun when that noun follows an adjective, or when the noun is followed by words that describe it more fully. 一种 (用于前有形容词或后有修饰语的不可数名词前)
例：The islanders exhibit a constant happiness with life.这些岛民表现出一种对生活的持久的幸福感。
[DET] You use a or an in front of a mass noun when you want to refer to a single type or make of something. 一种 (用于物质名词前，特指某物的种类或成分)
例：Bollinger "RD" is a rare, highly prized wine.是一种罕见的、非常名贵的葡萄酒。
[DET] You use a in quantifiers such as a lot, a little, and a bit. 用在量化词组中，如(a lot), (a little), (a bit##bit)等
例：I spend a lot on expensive jewellery and clothing.我在昂贵的首饰和衣服上开销很大。
[DET] You use a or an to refer to someone or something as a typical member of a group, class, or type. 指某人或某物是一个团队、阶层或类型中典型的一员或一部分
例：Some parents believe a boy must learn to stand up and fight like a man.一些家长认为一个男孩必须学会像男子汉一样奋起战斗。
[DET] You use a or an in front of the names of days, months, or festivals when you are referring to one particular instance of that day, month, or festival. 用于某一天、某一月份或某节日前，特指在该天、该月或该节日发生的事件
例：The interview took place on a Friday afternoon.该面谈是在一个星期五下午进行的。
[DET] You use a or an when you are saying what someone is or what job they have. 用于说明某人的职业
例：I explained that I was an artist.我解释说我是一位艺术家。
[DET] You use a or an instead of the number "one," especially with words of measurement such as "hundred," "hour," and "metre," and with fractions such as "half," "quarter," and "third." 一 (代替)(one)
例：...more than a thousand acres of land.…一千多英亩的土地。
[DET] You use a or an in expressions such as eight hours a day to express a rate or ratio. 每一 (用于速率或比率的表达中)
例：Prices start at $13.95 a yard for printed cotton.印花棉布开价为$13.95一码。
[V] → an informal or dialect word for
例：they'd a said if they'd known
[PREP] → (usually linked to the preceding noun) an informal form of
例：sorta sad
例：a kinda waste