名词
中文翻译：Unknown
同义词：
['primary irritant', 'primary irritant substance', 'primary irritant agent']
例句：
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1. The primary irritant in this chemical is ammonia.
这种化学物质的初级刺激物是氨。
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2.The primary irritant in theair was smoke from the factory.
空气中的初级刺激物是工厂的烟雾。
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3. Theprimary irritant in the waterwas pollutants from the river.
水中的初级刺激物是来自河流的污染物。