The shock wave and strong pulse noise, which produced by light rocket launcher, are belong to a non stationary signal process with a wide frequencies.

便携式火箭发射器所产生的冲击波和强脉冲噪声属非稳态信号，具有较宽的频率范围。

youdao

The object was too light to be a brick, but it was the same density as a piece of foam from a solid rocket booster.

这一物体太轻了而不可能是一个砖，然而它和固体燃料助推器上的泡沫的密度是相同的。

youdao

That means that, if you were travelling at the speed of light the whole time, it would take 4.2 years to get there "- or about 50, 000 years using current rocket science."

这意味着，如果你以光的速度履旅行，到那需要4.2年，或者用现在的火箭科学需要50,000年。

youdao

Neither the House nor the Senate ever specifically gave the green light to using a Delta rocket for the planned test mission.

WSJ: Lockheed Martin Sees Space Capsule Test Flight in 2013

These men have only very light weapons - machine-guns and rocket propelled grenades - and they have no answer when government forces decide to use heavy weapons, as they appear to have done overnight.

BBC: Homs attack: BBC reporter takes in differing accounts

The combination of the free-revving V6, a feather-light clutch and precise gear feel makes the IPL a rocket to drive.

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