The balloons only have one life and the only way of finding out whether they work is to attempt to fly around the world.

The balloons only have one life and the only way of finding out whether they work is to attempt to fly around the world.

气球只有一次生命，要想知道它们是否有效，唯一的方法就是尝试环游世界。

-- Richard Branson 理查德·布兰森