A heavy object, like a football player moving at a high speed, has a lot of momentum—that is, once he is moving, it is hard to change his state of motion.

一个重物有很大的动量，也就是说，比如一位高速移动的足球运动员一旦运动起来，就很难改变运动状态。

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We have looked at the medical aspects of runner's high which states that there is definitely a change in a person's physical state caused by the stress of running.

通过医学数据，可以证明在奔跑的紧张感下，身体的状态的确有变化。

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If an initiative is in an execution state, it is very difficult — and high risk — to add the burden of process change on top of other challenges.

如果在一个执行区域有了一个新项目，这会非常困难——并且高风险——将项目变革过程中的负担加在其它挑战之上。

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But orders from on high can't change the dearth of funding for Y2K remediation at large state-owned enterprises.

CNN: Page 3

On Wednesday, gay legal groups filed a petition asking the California high court to invalidate Proposition 8 on the grounds that voters lacked the authority to change state law.

NPR: States Weigh Gay Marriage, Other Sensitive Issues