1N-COUNT 痣;痦子 A mole is a natural dark spot or small dark lump on someone's skin. 痣;痦子
2N-COUNT 鼹鼠 A mole is a small animal with black fur that lives underground. 鼹鼠
3N-COUNT 间谍;卧底;内奸 A mole is a member of a government or other organization who gives secret information to the press or to a rival organization. 间谍;卧底;内奸
He had been recruited by the Russians as a mole and trained in Moscow.