... checkpoint n. 检查站,车站的行李房 ballooning n.气球操纵;乘气球 cumbersome adj.沉重的, 笨重的, 转动不灵的,大而笨重的；难以携带的 ...
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虽屡遭挫折，他们仍不断尝试乘气球环游世界。
Despite a number of setbacks, they persevered in their attempts to fly around the world in a balloon.
第一天，我们乘气球飞越了岩石，我惊讶于它是如此之大。
On the first day, we took a balloon tour over the rock, and I was surprised at how big it was.
他们周末喜欢乘气球玩。
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