S421是一种农药增效剂，本文探讨了S421在28种农药中的含量及其在茉莉花和茶叶中的残留降解动态。
The S421 is a synergist of insecticides, and this paper studied its contents in 28 kinds of pesticide, and its residue and degradation dynamic in jasmine flower and tea.
顾客通常根据质量等级购买茉莉花茶。特级茉莉花是最好的。人们有意把茉莉花芽放入茶叶，目的是要茶叶产生一种宜人的香味。
Customers usually buy jasmine tea according to its quality grades. Grade One is regarded as the best. Jasmine buds are intentionally put into the tea to produce an agreeable aroma.
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