The doctor drew off some fluid to relieve the pressure.
医生排掉了一些液体以缓解压力。
《牛津词典》
2
The basis of their experiments was the underlying knowledge that, due to their continual growth, tumors generate high fluidpressure in surrounding tissues.
他们实验的基础是如下知识，瘤随着其继续生长而在周围组织里形成高液压。
3
Fluidpressure on one side of the gate presses it against the opposite seat with great force and improves the seal.