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。
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。
The amount of angular momentum, say, a spinning skater has depends on both the speed of rotation, and the weight and distribution of mass around the center.
角动量的大小，取决于旋转中的滑冰选手的旋转速度、体重和绕旋转中心的质量分布。
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。
The analytical method provides theoretical basis for studying rules of layered failure of rock mass around deep-buried tunnel under different conditions.
该解析方法可为研究不同条件下深部洞室围岩破坏规律奠定理论基础。
There is obvious abnormal temperature feature in the intact rock mass around the water-hearing structure before mining.
通过试验得出：煤层开采前，初始地温场中含水构造处具有明显的低温异常特征；
Rockbursts in coal mines are dynamic failure in the rock mass around a mine opening or excavation. Its mechanism is very complex.
冲击地压是矿山工程中一种特殊的围岩破坏现象，发生机理十分复杂。
The prerequisite of rock burst occurrence is that the elastic energy in coal and rock mass around coal mine roadway and stope has accumulated enough.
冲击地压发生的前提是矿山井巷和采场周围的煤岩体中储存了足够的弹性能。
The prerequisite of rock burst occurrence is that the elastic energy in coal and rock mass around coal mine roadway and stope has accumulated enough.
冲击地压发生的前提是矿山井巷和采场周围的煤岩体中储存了足够的弹性能。
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