During the ascent the balloon is constantly widening because of the decrease of atmospheric pressure, and at a certain height it will inevitably burst.
在上升的过程中，随着气压的降低，气球不断膨胀，到一定的高度，气球就会爆破。
During the ascent the balloon is constantly widening because of the decrease of atmospheric pressure, and at a certain height it will inevitably burst.
在上升的过程中，随着气压的降低，气球不断膨胀，到一定的高度，气球就会爆破。
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