The descending of the airplane, similar to the climbing, is operated by stages. Flying through clouds is inevitable during descending, and the airing convection caused turbulence.

• 飞机的下降与上升一样，是分段进行，下降时产生的颠簸可能是紊流造成的，因为在下降过程中，常常不可避免地要穿过云层。