With passive control, the solar sail orbit is stable and its initial momentum determines the orbit parameters.

在只考虑轨道动力学的情况下，分析了太阳帆的被动控制。

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So, the "leverage-and-enhance-the-core-product" strategy is an easy reach to execute, and offers appealing initial momentum, but it is short-sighted.

因此，“发挥并增强核心产品优势”的战略虽然执行起来很容易，而且初期效果显著，但着实短视。

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In practice, it should function a lot like a battery in a car: it provides the initial spark to get the whole process moving, afterward momentum will take over.

在实际中，这就好比车的电池一样有颇多功用。它点燃了最初启动整个进程的火花，之后才会用到动力。

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The trick is to sustain that initial momentum, many say, will be releasing a stable of good games people will want to play.

CNN: Nintendo Wii U: Your reactions

Hurricane Gustav robbed the political circus of its initial momentum, forcing party organizers to scale back on all but the necessities earlier in the week.

FORBES: Magazine Article

The metronomic kicker has landed 33 attempts in a row for Scotland but he failed with three early penalties to stall the hosts' initial momentum.

BBC: Gloucester 3-16 Munster