the protective layer

Too much exfoliating removes the top layer of the skin, which is the protective layer.

使用过多去角质的产品会除掉皮肤的表层，也就是保护层。

The weight of these tubes holds the protective layer in place, while the gaps between the tubes permit the overspill to escape.

这些装满水的管子的重量足以固定住这些保护层，漫出堤坝的河水可以在粗管间溢过。

Since the 1970s, scientists have known that the protective layer is being depleted by manmade gases, in particularly the CFCs once used in aerosols .

自从20世纪70年代以来，科学家就知道这一保护层一直被人造气体损耗，特别是曾用于喷雾剂的氯氟烃。