名词
中文翻译：无明确对应翻译
同义词：
['无明确对应同义词，需根据具体情境确定。']
例句：
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1. The plant cudweed is known for its ability to purify water.
这种植物被称为净化水的能力。
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2. Researchers are studying the ecology of the cudweed, looking for ways to protect it.
研究人员正在研究这种植物的生态学，寻找保护它的方法。
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3. Cudweed is a rare and endangered species, with populations declining rapidly.
苦苣苔是一种稀有且濒危的物种，其数量正迅速下降。