a的中文翻译及用法

art.

1.（非特指的）一（个）

2.（同类事物中）任何一个

3.每一（个）

4.某一种

5.（用于某些物质名词前）一种

6.（=the same）同一（个）

7.（与否定词连用，相当于any）

8.【口】（用于虚拟语气，=have）

pron.【方】

1.他，她，它

2.他们，她们，它们

3.我

abbr.

1.（用于旅行时刻表）arrive

2.（用于日期前）before

英语解释

(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

the basic unit of electric current adopted under the Systeme International d'Unites

a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

the blood group whose red cells carry the A antigen

the 1st letter of the Roman alphabet