a.

• [医] 调节，适应，安培，阳极，正极，前，水，水剂，动脉

英英释义

名词 a:

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

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

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

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

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

6. the 1st letter of the Roman alphabet

7. the blood group whose red cells carry the A antigen

词汇搭配

• with a pinch of salt 有保留地
• stand a chance 有希望
• a dose of one's own medicine 自己惹来的恶果,自己...
• flog a dead horse 徒劳无益
• keep a stiff upper lip 坚定不移(顽强不屈...
• once in a blue moon 罕见的，极少的，难得...
• show a clean pair of heels 逃走(溜之大吉)...
• birds of a feather 同类型的人
• with a grain of salt 有保留地
• bring to a stand 终止
• turn over a new leaf 重新开始
• as a matter of fact 事实上
• bring to a standstill 结束(使终止...
• turn up again like a bad penny 不要它偏又回来,挥去...
• at a loose end 无事做
• throw a fit 大发脾气
• blow a fuse 使保险丝熔断(勃然大...
• cut a poor figure 出丑
• take something with a grain of salt 将信将疑
• on a razor-edge 处于危险关头...