水蛭素

例句：

1. 1. The researcher found that the water snail secreted a substance that could be used as a drug.
   研究者发现水蜗牛分泌的物质可以用作药物。
2. 2. The water snail's secretion is a promising source of anticoagulant drugs.
   水蜗牛的分泌物是抗凝血药物的一个有前景的来源。
3. 3. In traditional Chinese medicine, water snail secretion has been used for centuries to treat various ailments.
   在传统中医中，水蜗牛分泌物被使用了几个世纪来治疗各种疾病。