Early jet engines had narrow inlets and were very noisy, but as the diameter of the fans at the front increased, the engines became quieter.

早期的喷气式发动机进气口狭窄且噪音巨大但是随着前部风扇直径的增大发动机变得越来越安静。

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The new trainers will prepare fast jet aircrew for flying front-line aircraft with a modern cockpit environment of digital displays sophisticated navigation and advanced avionics.

新的教练机将为前线飞行飞机配备快速喷气飞机空勤人员，以及数字显示的精密导航和先进航空电子设备的现代驾驶舱环境。

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Whereas jet engines were long and slim in the 1960s, today they have a vast opening at the front containing a giant fan.

60年代的喷气式飞机引擎又长又细，而今天它们的前端有了一个硕大的开口，巨大的风扇包含其中。

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And the jet black front display flows smoothly into the body for a seamless look with no gaps.

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The jet carried a student pilot in the front seat and an experienced instructor behind him, and the leakage of jet fuel was "one of the indications that there was a mechanical malfunction, " Navy Capt.

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Some of the possibilities that have been reported include ground troops, CF-18 jet fighters and naval frigates on the front lines.

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