科学与环境
My son goes to the gym a lot. How can I tell if this is healthy or a sign something is wrong?
来源: Phys.org - latest science and technology news stories · 发布于
A teenage boy goes to the gym several times a week. He takes protein powder and watches what he eats carefully. He talks about being "ripped" or "jacked."
A teenage boy goes to the gym several times a week. He takes protein powder and watches what he eats carefully. He talks about being "ripped" or "jacked."
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