They have to put a lot of heavy metal iron chains around their bodies so that they can control and balance their take - offs and landings . thats what they do 他们要在身上绑很多很重的铁炼，才能平衡重量，起飞和着陆的时候才容易控制，真的就是这样。
2.
So they have to come down sometimes . they have to put a lot of heavy metal iron chains around their bodies so that they can control and balance their take - offs and landings 他们要在身上绑很多很重的铁? ，才能平衡重量，起飞和著陆的时候才容易控制，真的就是这样。
