An airplane cannot fly to the moon, because the air only reaches a height of 240 kilometers. Then there is no air. But a rocket can fly even when there is no air.

• 飞机不能飞到月球上去，是因为飞机只能到达24万米的高度，再往上就没有空气了，但火箭即便在无空气时也能飞行。