The sound of the exhaust jet undulated slightly.

的声音，排气射流略有起伏。

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The sound of the exhaust jet was very loud, and undulated slightly.

的声音，排气射流是非常响亮，并略有起伏。

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Flow parameters of exhaust jet on a lean steel platform were measured in the experiment during a practical launching.

实验对火箭发射阶段管后冲击流场在平面斜钢板上的流动参数进行了测量。

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According to the International Air Transport Association (IATA) jet engines today are 40 percent more fuel-efficient than those designed in the 1960s, with pollutants such as soot and sulphur now almost completely eliminated from jet exhaust.

CNN: Green wing:?can technology make flying more environmentally friendly?