The effect of individual exercise on bone mass.
单纯运动对骨量的影响。
On the individual level, exercise can improve both our physical and mental health.
在个人层面上,锻炼可以改善我们的身心健康。
The previous exercise shows that individual residents gain from their marginal contribution if and only if the park is smaller than.
以上练习表明当且仅当公园面积时,居民捐款的边际收益是为正。
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