Most people reach their peak bone mass around age 30.

大部分人在30岁左右的时候到达其骨量峰值。

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They store the energy mechanically by rotating mass around an axis.

它们通过质量绕轴旋转机械存储能量。

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These changes are caused by anything that moves mass around on the Earth.

地球上物质体的任何移动都会引起这些变化。

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Cities in the United States and Europe have increased security in and around their mass transportation systems.

VOA: special.2010.04.03

In the wake of the bombings, cities in the United States and Europe boosted security in and around their mass transit systems.

VOA: standard.2010.03.30

It also runs Disaster Victim Identification training for police offers to help them deal with mass fatalities around the world.

BBC: Crime writers back Dundee University ?1m morgue fund

He envisions a slimmed-down Ford Motor that pitches one mass market brand around the world: Ford.

FORBES: Back To The Future

These winds are generated in a swirling mass of matter around the equatorial region of a black hole, the accretion disk.

CNN: Black holes in a new light