名詞 chemical agent:

1. an agent that produces chemical reactions

1. A substance containing chemical agents or abrasive particles and applied to smooth or shine a surface.
   上光劑; 擦亮劑含有化學媒質或粗糙微粒的一種物質，被用來打光或擦亮一個表面
2. A chemical agent that kills eggs, especially the eggs of insects.
   殺卵劑一種殺死卵的化學藥劑，尤指殺死蟲卵的殺蟲劑