And therefore, when you let it go the balloon will go in this direction which is the basic idea behind the rocket.

此时放手，气球会向此方向飞出，火箭就是照这个思路设计出来的。

youdao

And therefore, when you let it go the balloon will go in this direction which is the basic idea behind the rocket.

此时放手，气球会向此方向飞出，火箭就是照这个思路设计出来的。

youdao