名词
中文翻译：除草剂
同义词：
['herbicide', 'weed killer']
例句：
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1. The farmer used a defoliating agent to control the weeds in his field.
农民使用一种除草剂来控制他田地里的杂草。
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2.The chemical was designed to be safe forhumans and non-target plants.
这种化学物质被设计为对人类和非目标植物都是安全的。
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3. The use of defoliatingagents is strictly regulated by environmental agencies.
环境机构严格监管除草剂的使用。