Michael was showing the nurse how to suction his saliva.
迈可正演示给护士看如何吸出他的唾液。
《柯林斯英汉双解大词典》
2
Dust bags act as a filter and suction will be reduced if they are too full.
灰尘袋是一个过滤器，一旦太满吸力就会减弱。
《柯林斯英汉双解大词典》
3
It was only when the hull was hanging freely from the lifting frame, clear of the seabed and the suction effect of the surrounding mud, that the salvage operation progressed to the second stage.