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Elle Hunt is a freelance journalist
Objects have a class, and a fixed size based on their class.
A new study shows that exposure to two specific 'forever chemicals' may accelerate biological aging, especially in middle-aged men. Researchers revealed a link between faster epigenetic aging, and two of these alternatives, PFNA and PFOSA, a precursor of PFOA.
· 张伟 · 来源：tutorial资讯