The method to describe the balloonshape with three characteristic parameters is put forward, and the parameter that can represent the tension change the most effectively is selected out.
提出用三个特征参数描述气圈形态的方法，并选择出能够最有效反映张力变化的形态特征参数。
2
What is the shape of Amy's balloon?
艾米的气球是什么形状的？
3
It worked like a hot air balloon underwater, since the petrol in the balloon could not be compressed, so it could keep its shape even in great pressure.