制造合成角质的层试，导致了赛璐珞的产生。
Celluloid resulted from efforts to produce a synthetic horn.
使用过多去角质的产品会除掉皮肤的表层，也就是保护层。
Too much exfoliating removes the top layer of the skin, which is the protective layer.
如果暴露在过度的阳光下，那些用于清洁皮肤和去除角质的产品就将会伤害到我们的皮肤。
Products such as cleansers and skin peels can cause damage to the skin if exposed to excessive sunlight.
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