1 a small dark spot on a person's skin that never goes away 痣 ☞Look at freckle. 参看freckle。

2 a small animal with dark fur that lives underground and is almost blind 鼹鼠

3 (informal 非正式) a person who works in one organization and gives secret information to another organization 内奸；间谍 [SYN] spy 同义词为spy

4 (in chemistry 化学) a unit for measuring the amount of a substance 摩尔（物质的计量单位）