But by firing its three ion engines one at a time over 620 days — accumulating another 60 miles per each day — Dawn has reached its current astronomical speed and has no plans of slowing down.

但是在620天的时间里开动了三个引擎之一——再积累每天60英里——曙光号就已达当前的天文速度，而且没有减速的计划。

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Driving a huge mass with a high speed to impact the tube of gun weapon is a feasible technology used to simulate the firing process.

采用高速大质量块撞击火炮身管是一种技术可行的火炮射击模拟试验方法。

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And easy firing, stable burning, and comparatively large increasing of characteristic speed are demonstrated by combustion experiment.

燃烧试验易于点火，能稳定燃烧，特征速度有较大提高。

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Girardi said Price had no-hit stuff, and Yankee batters reported that he was attacking them with off-speed pitches rather than firing 97-mph fastballs as he usually does.

WSJ: Tropicana Demons Exorcised

In a break from a training session during which he was firing balls at his charges with alarming speed, Liu admitted his fame comes with boatloads of pressure.

WSJ: Four Chinese Table-Tennis Stars Expanding Sport's Popularity