水蛭;蚂蟥a small worm that usually lives in water and that attaches itself to other creatures and sucks their blood. Leeches were used in the past by doctors to remove blood from sick people.
2.
依赖他人钱财者;攫取他人收益者;寄生虫a person who depends on sb else for money, or takes the profit from sb else's work