随后钻头处的压力降使扩眼工具处于打开状态，当流速下降时弹簧将活塞收回至原处。
A pressure drop through the bit maintains the tool in the open position while the return springs close the pistons when flow decreases.
由于纬纱进入了一个流速下降的场中，使得问题更加严重，此时相当于气流从后面推动纬纱，纬纱前端的速度低于后部的速度。
The problem is increased because the filling moves into a field of declining air velocity and thus behaves as if it is propelled from behind; the front moves slower than the rear and the yarn buckles.
通过对椎动脉收缩期切迹组与无切迹组做束臂试验，比较束臂前后收缩期血流速度下降幅度及流速自下降至恢复的时间。
Compare the decline in blood flow velocities and its recovery time before and after Trousseau's test in vertebral waveform with or without notch at systole.
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