When an object is immersed in the water, the water exerts an upward force called upthrust on the object in question.

当一个物体浸入水中时，水会对该物体施加一个向上的力，即向上的推力。

The long swish of it lifted on an invisible wave with syllables of boomerang antennae, funnels arcing back, a pi-shaped upthrusting at the stern.

它长长的嗖嗖声在一个看不见的波浪上升起， 波浪带有飞旋镖天线的音节，漏斗向后弧形， 船尾呈圆周率上升。