Easy to test.
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送交者: habpi 于 2015-05-17, 09:12:24:
回答: 我一直怀疑到底sunburn的危害大还是sunscreen 里的chemical对皮肤危害更大。 由 shine 于 2015-05-16, 18:49:26:
Apply sunscreen to your right arm, and leave left as control this summer. Report back in the fall. LOL
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