In accordance with the technology of ultrasonic nondestructive pressure measurement, a sing-around device was developed for measuring the propagation time of ultrasonic wave.
针对超声波无损压力检测技术，开发了一种采用回振法测量超声波传播时间的装置。
Sometimes, they do sports or sing karaoke to release pressure.
有的时候，他们做运动或唱卡拉0k来释放压力。
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