可以区分开来的外部周界是表皮层，由无定形组织的蜡质和果胶构成。
The cuticle exists as the separable outer boundary and consists of a layer of wax and pectin materials that appears to be structureless.
研究认为，角质层中电子密集物可从表皮、下皮细胞外部伤害细胞。
It was suggested that the epidermal and hypodermal cells were damaged by EDM in the cuticle from outside of the cells.
所有办公室都可以享受日光，还有外部景观视野，并形成建筑的“居住表皮”。
The offices all benefit from direct daylight and outside views, and form what could be regarded as the building's "inhabited envelope".
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