名词
中文翻译：水蛭
同义词：
['leech', 'water scorpion', 'water lobster']
例句：
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1. The tachinid was found in the riverbed, causing a lot of damage to the environment.
这种水蛭被发现在河床上，对环境造成了很大损害。
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2. The tachinid is a small creature that feeds on blood.
这种水蛭是一种小型生物，以血液为食。
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3. The tachinid has been used as a biological control agent for decades.
这种水蛭被用作几十年的生物控制剂。