UC知道各位英语高手请帮满翻译一下，解小弟燃眉之急
来源：百度知道 编辑：UC知道 时间：2024/06/06 05:36:42
Jet Airplanes
Both the character and the sound level (magnitude) of jet airplane noise has
changed over time as new engine technologies have been developed and
introduced into the airline and business jet aircraft fleets. The old, pure-jet
engines produce noise that is both very loud and at the high end of the frequency
spectrum. Newer generation, fan-jet engines—in which a substantial
volume of the air entering the engine bypasses the combustion chamber—
create noise that is comparatively lower both in magnitude and frequency.
Even among fan-jet engines, noise levels have been considerably
reduced with the most recent models compared to the earliest types
Both the character and the sound level (magnitude) of jet airplane noise has
changed over time as new engine technologies have been developed and
introduced into the airline and business jet aircraft fleets. The old, pure-jet
engines produce noise that is both very loud and at the high end of the frequency
spectrum. Newer generation, fan-jet engines—in which a substantial
volume of the air entering the engine bypasses the combustion chamber—
create noise that is comparatively lower both in magnitude and frequency.
Even among fan-jet engines, noise levels have been considerably
reduced with the most recent models compared to the earliest types
喷气飞机.
两者的性质和声压级(震级)喷气飞机噪音已随着时间改变,新的引擎技术 已经开发和引进的航空公司及商用喷射机174. 旧法,纯喷气发动机所产生的噪音,是非常响亮,在高端的频谱. 新一代, 扇喷射引擎,其中相当数量的空气进入发动机bypasses燃烧室-制造噪音就是 相对较低,无论在规模和频率. 即使在扇喷气发动机,噪音水平已大大减少,与最新型号比最初型