我们锻炼时,肌肉会产生酸,这种酸通常被血液中的氧气所耗掉.如果这些酸积存在血液里,结果就是疲劳.在剧烈运动中,血液中的氧不足够消耗产生的所有这些酸.因此,经过连续的大运动量锻炼后我们会变得更强壮.
when we exercise,our muscles throw off acids that are normal
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