这些种类中有部分的鱼不具备可以自由上浮下沉的鱼鳔或者气囊。
Some species also don't have swim bladders, gas Chambers that help other fish control their buoyancy as they travel up and down the water column.
部分浸没或全部浸没在流体中的物体所受到的向上浮力，等于它所排开流体的重量。
The upward buoyant force on an object partially or wholly submerged in a fluid is equal to the weight of the displaced fluid.
应用推荐