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.
不要做任何会让你受伤的新事物。这是一个内心痊愈时期，你不需要和它一并出现外部伤害。
Do not do any thing new that may injure you. It is inner healing time and you don't need outer harm along with it.
我们可以在外部通过防晒霜保护皮肤不受紫外线伤害。
We can protect skin from ultraviolet light externally by using a sunblock.
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