protective covering
近义词：protection，protectivecover，
英英释义
Noun
- a covering that is intend to protect from damage or injury;
"they had no protection from the fallout" "wax provided protection for the floors"
- the tough natural covering of some organisms
例句
用作名词(n.)
- These electric wires are protected by a rubber covering.这些电线用橡胶作防护层。