Aquatic blood-sucking annelids of the class Hirudinea.

蛭纲的水生吸血环节动物。

People who exploit others and live off them.

比喻靠他人牟利、寄生他人的人。

Glass tubes for drawing blood by vacuum; historical device.

通过真空抽血的玻璃管，历史用具。

Applies a leech medicinally so it sucks blood.

医学上贴上水蛭以吸血。

Drains resources without giving back.

不回馈地消耗他人资源。