It finds it common that the density of exercise and the load of sport in the two classes investigated is lower than the common level at home and abroad.
结果表明，与国内外一般要求相比较，两个班均存在练习密度和运动负荷偏低的情况。
This paper analyses the density of exercise and the load of sports in the course of PE teaching in Tong Jiaqiao Middle school by applying the information and the method of comparative analysis.
运用文献资料和比较分析等方法，调查分析了重庆童家桥中学教学过程中的体育课练习密度和运动负荷。
Bone density contributes to the strength of the bones; and their density changes in response to body weight and to weight-bearing exercise.
骨密度代表骨的强度，骨密度依随体重和负重锻炼而相应升降变化。
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