名词
中文翻译：Unknown
同义词：
['permethrin', 'lambda-cyhalothrin', 'bifenthrin']
例句：
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1. Pyrethrins are a type of insecticide that is effective against many types of insects.
吡虫啉是一种有效的杀虫剂，对许多类型的昆虫都有效果。
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2. The farmers use pyrethrins to protect their crops from pests and diseases.
农民们使用吡虫啉来保护他们的作物免受害虫和疾病的侵害。
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3. Insects are sensitive to pyrethrins and will not survive long after being exposed to them.
昆虫对吡虫啉敏感，暴露后很难存活很长时间。