对于缓慢的计算机来说，启动和停止音频引擎要花一两秒时间，因而会在输出的事件之间留下不必要的长长的静音。
A slow computer will take a second or two to start and stop the audio engines, leaving unnecessarily large silences between events in the output.
波音的静音喷气机：波音公司的概念图，将引擎放置在在机翼上方，并且增加一个额外的音障。
Boeing Boomless Jet: Boeing's concept places the engines on top of the wings, adding an extra sound barrier.
波音的静音喷气机：波音公司的概念图，将引擎放置在在机翼上方，并且增加一个额外的音障。
Boeing Boomless Jet: Boeing's concept places the engines on top of the wings, adding an extra sound barrier. NASA via wired.
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