法律也开始涉及到空气、水和噪音等问题。
Laws are being made dealing with air, water and noise pollution.
针对调节阀的流量特性、压降、闪蒸、气蚀及噪音等问题介绍了调节阀在选型和应用中的要点。
This paper introduced control valve selection and its application based on the theory of flow characteristic, pressure drop, flashing, cavitation and noise.
而另一半的元凶则是飞机自身的结构问题：颠簸不平的气流穿梭过往时同起落架、翼缝和襟翼等结构相遇制造了另一半噪音。
But the frame of the aircraft itself is to blame for the other half: the bumpy air flow over the undercarriage and the slots and flaps of the wings creates the rest of the racket.
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