Then when you start running out of air, wave it back and forth so I can see it.

等快没空气的时候 前后挥动，让我可以看到。

Much like a boat in water, a plane in the air leaves a wake behind it, only instead of swirly water waves, it's swirly air waves, and if you try to water-ski in it, you'll die.

就像水中的船一样， 空中的飞机在身后会留下尾流，只不过那不是旋转的水波，而是旋转的空气波， 如果您试图在其中滑水，您就会丧命。