a

美[ə] 英[ə]

art. 一(个)；每一(个)；任一(个)

n. 英语字母表的第一个字母；学业成绩得优者；表示“最好”的符号

名词复数：a's

近义词：any，one，axerophthol，ampere，angstrom，angstromunit，amp，adenine，antiophthalmicfactor，deoxyadenosinemonophosphate，vitaminA，

art.(冠词)

n.(名词)

adj.(形容词)

Noun

a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation
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;
"a typical household circuit carries 15 to 50 amps"
the 1st letter of the Roman alphabet
the blood group whose red cells carry the A antigen

用作冠词(art.)

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热门英语单词