According to true state of the stress and the strain near the cavity, a new formula of velocity field has been deducted by use of the conservation laws of momentum and mass.

然后以压碎区应力与变形的真实状态为基础，运用动量与质量守恒关系推导了爆破压碎区新型的速度场关系式。

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At the same time clearly strain energy conservation goals.

同时明确了应变建筑的目标。

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Carter Roberts, chief conservation officer for the World Wildlife Fund, said that the strain on natural resources threatens environmental progress as the world strives to match America's prosperity.

CNN: Challenges ahead for a changing Earth