虽然肯定要比喷气式飞机速度慢一些，但是混合型的飞艇基本上没有噪声，同时起飞和降落都不需要下面的基础设施。
Although certainly slower that hopping on a jet, the hybrid blimps are nearly silent and require very little infrastructure to take off and land.
马什预计，燃料电池能用在草坪割草器、吹雪机、喷气推进装置和其他目前导致噪声以及空气污染且用蓄电池做动力运转性能不佳的移动设备上。
Marsh envisions fuel cells in lawn mowers, snow-blowers, jet skis and other mobile devices which now contribute to noise and air pollution, and which don't run well on batteries.
通过对涡轮喷气及涡轮风扇发动机试车噪声的采集和声功率谱分析，讨论发动机的主要噪声源和噪声的特征。
Through noise data collection and power spectrum analysis of turbojet and turbofan, the main noise source and characteristics of noise are discussed.
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