水蛭的前端有非常发达的吸盘。人们下水田劳动、涉水过河或游泳时，常受到水蛭的袭击，常吸付叮在腿部，亦有进入尿道、阴道、肛门，甚至有钻进鼻孔、口腔吸附粘（结）膜上而流血等现象发生。水蛭是种名贵中药材。从水蛭唾液腺中提取的抗凝血物质，称之“水蛭素”。近年来还发 Leech front has a very developed sucker. When people go to paddy fields to work, wading across rivers or swimming, they are often attacked by leeches. They often absorb bites on their legs and enter the urethra, vagina, and anus, and even drill into the nostrils. The bleeding and other phenomena occur. Leech is a kind of expensive Chinese herbal medicines. Anticoagulant substances extracted from leech salivary glands, called “hirudin.” In recent years also made