参考词典中protective covering的常规释义：
基本释义
参考例句
- This prehistoric animal grew a thick protective covering.
这种史前动物长着一层厚厚的保护性外皮。
英英解释
- a covering that is intend to protect from damage or injury
[同]
protection, protective cover, protective covering
[例]
- they had no protection from the fallout
- wax provided protection for the floors
- the tough natural covering of some organisms
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