百草枯，又名克无踪，是一类有机杂环类农药，是世界上应用较早的除草剂。
Paraquat, also known as Gramoxone, is a class of heterocyclic organic pesticides, is the world's earlier application of herbicides.
金是常用的电极材料和SERS基底，而含氮有机杂环分子的表面吸附和反应过程是饶有兴趣的研究体系。
Gold is an ordinary material for electrode and a good SERS substrate, and the study of nitrogen-containing organic molecules on this substrate is an interesting research subject.
杂环偶氮试剂是一类重要的有机显色剂。
Heterocyclic azo dyes are one group of the most important chromogenic reagents in spectrophotometric analysis.
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