A-一般来说 有两种解释，一是英文单词的词头，二是一种评分标准，亦有时表示A股。
专业释义英英释义
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处于...状态或过程中；在…之上；朝着；用于加强语气 - 引用次数：373 参考来源 - 失敏态脑N受体药理学特征的研究
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a- [ ə ]
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n.
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a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
同义词： angstrom angstrom unit A
- any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
- one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
- (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
- the basic unit of electric current adopted under the Systeme International d'Unites
- the 1st letter of the Roman alphabet
- the blood group whose red cells carry the A antigen
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a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
以上来源于: WordNet
柯林斯英汉双解大词典
a- /ˈeɪ-/
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1.
PREFIX A- is added to the beginning of some adjectives in order to form adjectives that describe someone or something that does not have the feature or quality indicated by the original word. 表示“非、无”
例：I'm a completely apolitical man.
我是个对政治完全不感兴趣的人。
例：...asymmetrical shapes.
...非对称的形状。
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2.
PREFIX on; in; towards 在...上; 在...内; 向...
例：afoot
例：abed
例：aground
例：aback
双语例句原声例句权威例句
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They had a butler, a cook, and a maid.
他们有一位管家、一位厨师和一位女仆。
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"Ha!" It was a cross between a laugh and a bark.
“哈！”那是一种一半是笑一半是厉声喊叫的混杂声。
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He was a ladies' man. A cheater. A player.
他曾是个花花公子，一个骗子，一个四处寻欢作乐的浪子。
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The three-and-a-half percent growth was the first expansion in more than a year, and the strongest in two years.
VOA: special.2009.10.30
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She's stuck to a -- this is remarkable: she's stuck to a "marble venomed seat smeared with gums of glutinous heat."
这个值得注意，她坚持坐在,涂满胶状树胶的邪恶石头凳子上“
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it's a two-and-a-half-year-long program that mixes biology, chemistry, physics and computer science together.
这门课是一个两年半的项目，涵盖了生物学、化学、物理学，还有计算机科学。
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