integument
n. 覆盖物；（动植物的）皮肤，外皮
例句
The micropyle was formed by the inner integument.
珠孔由内珠被形成。
The integument grew fast and overgrew the nucellus.
珠被生长较快，并逐渐包围珠心。
Inner cells in the integument differentiated into integument tapeta.
珠被内层细胞特化为珠被绒毡层。
