名词
中文翻译：外部刺激物
同义词：
['external contaminant', 'external pollutant']
例句：
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1. The chemical wasa known external irritant to humans.
这种化学物质对人类已知是一种刺激性物质。
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2.The new product is designed to be an external irritant for the environment.
这款新产品旨在成为对环境的刺激性物质。
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3.The researcher found that some chemicals were external irritants to the eyes.
研究者发现某些化学物质对眼睛有刺激性。