他看到喷气机从头顶飞过，就想到可以用气象探测气球来飞行。
As he watched jets fly overhead, an idea came to him to use weather balloons to fly.
当他看到喷气机从头顶飞过时，就想到可以用气象探测气球来飞行。
As he watched jets fly overhead, an idea came to him to use weather balloons to fly.
当他看到喷气机从头顶飞过时，就想到可以用气象探测气球来飞行。
As he watched jets fly overhead, an idea came to him to use weather balloons to fly.
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