1、The upward force exerted by water on a submerged or floating body is called upthrust.
水对于浸入或浮在水中物体所产生的向上的力被称为上浮力。
2、The upthrust of the wings allows the bird to soar effortlessly in the sky.
鸟翼的上升力使得它能够在天空中轻松地翱翔。