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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Taking that pill would allow osteoporosis sufferers to get the bone-building benefits of exercise without risking fractures or falls.

骨质疏松患者服用这种药物强健骨骼的效果和锻炼类似，但没有摔倒或骨折的风险。

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Furthermore, you should avoid high-impact exercise to lower the risk of breaking a bone.

进而，你应该避免冲击大的运动来降低骨折的风险。

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Also on board is a new exercise machine, which is part of ongoing studies into the effects of long-term space flight on muscle and bone loss in astronauts.

VOA: standard.2010.04.05

It will also store a treadmill the crew must use regularly to exercise their bodies and maintain bone density.

BBC: Shuttle Endeavour launches from Florida

An exercise regimen also can keep up bone density and let a person avoid getting on the drugs.

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After three years, those in the exercise therapy group had maintained their bone density, unlike the small control group that was inactive.

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