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。
Starting at sea level and reaching at a maximum height of the top of the cliff, so therefore given the option with the appropriate architectural manipulations to increase or decrease the total size.
从海平面达到悬崖的最高点的最大高度值，因此选择适当的建筑操作来增加或者减少总大小。
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