mole

1. N-COUNT A mole is a natural dark spot or small dark lump on someone's skin. 痣

Researchers studied moles on those aged between 12 and 50. 研究者们研究了12岁到50岁的人身上长的痣。

2. N-COUNT A mole is a small animal with black fur that lives underground. 鼹鼠

3. N-COUNT A mole is a member of a government or other organization who gives secret information to the press or to a rival organization. (政府或机构内的) 间谍

He had been recruited by the Russians as a mole and trained in Moscow. 他曾经被俄国人招做间谍，在莫斯科受训。

4. N-COUNT a breakwater 防波堤

5. N the basic SI unit of amount of substance; the amount that contains as many elementary entities as there are atoms in 0.012 kilogram of carbon-12. The entity must be specified and may be an atom, a molecule, an ion, a radical, an electron, a photon, etc 摩尔; 微观物质的基本物理单位