The superior pharyngeal constrictor assists in gaining velopharyngeal closure, while peristaltic movement of food is facilitated by the middle and inferior pharyngeal constrictors.
咽缩上肌辅助颚咽的闭锁，而咽上缩肌和咽缩中肌使食物蠕动较容易。
In the peristaltic pump, a plurality of rollers roll to press an elastic hose continuously, so that liquid is transported in accordance with the movement direction of the rollers.
该蠕动泵是 由几个滚轮滚动连续不断地压迫弹性软管，将流体按滚轮运动的方向输送。
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