a.

a.读音音标

a.意思解释

abbr.

adjective 形容词；

英英释义

n.

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：angstromangstrom unitA

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

同义词：vitamin Aantiophthalmic factoraxerophtholA

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

同义词：deoxyadenosine monophosphateA

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

同义词：adenineA

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

同义词：ampereampA

the 1st letter of the Roman alphabet

同义词：Aletter a

the blood group whose red cells carry the A antigen

同义词：Atype Agroup A

双语例句

用作冠词(art.)There is a pen on the table.桌子上有一支笔。We have a problem.我们有个问题。I can only carry two at a time.我一次只能带两个。Let\'s go to a Chinese restaurant.我们去一家中餐餐馆。A cat is an animal.猫是动物。