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。
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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