单词：leeches
n a follower who hangs around a host (without benefit to the host) in hope of gain or advantage
v draw blood
leeches的用法和样例：
例句
- Throughout the 18th and 19th centuries, using leeches for medical reasons was very popular.中世纪欧洲的医生用水蛭治疗他们的病人。
- With the new fossil, researchers can now identify the animals as part of the annelid worm family, which also includes modern sea mice, earthworms and leeches.因为这个新的化石，研究人员现在可以鉴别出该动物属于环节虫属，这类动物中包括现代的海毛虫，蚯蚓和水蛭。
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