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1. The violet layer on theskin is a sign of aging.
皮肤上的紫色层是衰老的标志。
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2. Thescientist found a new wayto treat cancer using theviolet layer.
科学家发现了一种新的方法,使用紫色层治疗癌症。
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3. Theviolet layer was so thin that itcould not protect the plant from the sun's rays.
紫色层非常薄,无法保护植物免受阳光的照射。