有人怀疑它不准。其实准不准不重要,对于自己,只需要相对值即可。比如今天比昨天高5,还是高10,就知道是否变好还是变坏。
有人怀疑它不准。其实准不准不重要,对于自己,只需要相对值即可。比如今天比昨天高5,还是高10,就知道是否变好还是变坏。
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