Measuring wave velocity of liquid surface wave by the method of ultrasonic grating measurement for sound velocity The cruising speed of this new type of fighter is Mach two.
超声光栅测声速的方法运用到液体表面波波速的测量这种新型战斗机的巡航速度为声速的两倍。
When he was angry he gritted his teeth with a terrifying, grating sound.
他一生气就咬紧牙关,把牙齿磨得可怕地吱吱作响.
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