outer tegument
protective tegument
tegumentary system
A: How does the tegument protect the cell?
A：被覆物是如何保护细胞的？
B: It acts as a barrier against harmful substances.
B：它起到了抵御有害物质的屏障作用。
1) 生物学中的外皮或被覆层
2) 覆盖在物体表面的保护性结构
1. 外皮；被覆物
noun
1. A natural outer covering, especially of an animal or plant.
Synonym: integument, covering