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因此，预防和治疗皮肤光老化很有必要。
Thus it is necessary to prevent and treat skin photoaging.
youdao
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讨论了光对纸的老化作用及其机理。
Aging of paper and its mechanism under different light sources were discussed.
youdao
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讨论了光对纸的老化作用及其机理。
Aging of paper and its mechanism under different light sources were discussed.
youdao