They're just a bunch of leeches living off others!

他们只不过是一帮靠别人生活的寄生虫！

A genuinely comprehensive medical practice does not have to include leeches, the eye of newt, or dragon dung.

真正全面的医学实践并不一定要包括水蛭、蝾螈之眼或龙粪。

Farmers are not leeches on society.

农民不是水蛭对社会的影响。

Leeches were applied to the temples.

水蛭被应用于寺庙。

Don't be one of the leeches , buy me a beer.

别当伸手党，给我买杯啤酒吧。