发动机变得越来越安静
The engine is getting quieter and quieter
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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.
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