outer covering翻译

outer covering的基本解释

读音: 美: 英:

外罩：用于保护或覆盖物品的外层材料或物品。

例句

They change sugar into acids, which break down the tooth's harder outer covering.它们把糖转化成酸，酸会腐蚀较硬的牙齿外层。
The cells of an animal have a bag-like outer covering, called a membrane.动物细胞有一个口袋状的外层，叫细胞膜。
The outer covering of the egg is waterproofed to prevent the embryo from drying out.鸡蛋的外壳是不透水的，防止胚胎失水。

短语

the outer covering 外面覆盖物 ; 外壳
vest with silk outer covering 绸面背心
outer covering protection 外壳防护等级
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