adv. 同样地, 例如
prep. 做为, 当作
conj. 当...之时, 以...的方式, 像...一样, 因为
[计] 高级系统, 先进系统, 辅助存储器, 自治系统
n a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
n a United States territory on the eastern part of the island of Samoa
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
n any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes
n one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
n (biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA
n the basic unit of electric current adopted under the Systeme International d'Unites
n the 1st letter of the Roman alphabet
n the blood group whose red cells carry the A antigen
r to the same degree (often followed by `as')
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