点击下方单词,选择对的这个单词
名词
1. 防腐剂；保护剂A preservative is a chemical that prevents things from decaying. Some preservatives are added to food, and others are used to treat wood or metal.
1. a chemical compound that is added to protect against decay or decomposition
多通过句子记忆单词，而不是单独死记硬背。
