如果你还是20来岁或30来岁，医生说，润肤霜能给你一些必需的保护，使你的皮肤不致早衰。

If you're in your 20s or 30s, doctors say, moisturizers will give you some of the protection you need to keep skin from prematurely aging.

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研究人员认为，此法使患者达到“人工冬眠”状态，减缓身体和血液供给，从而给医生多留出些时间处理破裂或阻塞的血管。

The belief is that this creates a state of 'artificial hibernation' that slows the body and blood supply, which gives doctors more time to deal with burst or blocked blood vessels.

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PRK是移除角膜薄的表层(上皮细胞)，然后眼科医生用激光使角膜平坦或弯曲。

PRK removes the thin surface layer of your cornea (epithelium). Your eye surgeon then USES a laser to flatten your cornea or make its curve steeper.

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