The colourful balloons rose high into the air.
五颜六色的气球腾空而起。
Balloons float in the air as boats float on water.
气球飘在空中如同船浮在水上一样。
Why do balloons float in the air?
气球为什么能漂在空气中？
Hydrogen is a useful gas for balloons. It is lighter than air.
氢气对于气球来说是一种有用的气体，它比空气轻多了。
Many hot air balloons race in New Mexico each year.
每年在新墨西哥有很多热气球比赛。
Beware of the hot air balloons and billboards that can bring down your aircraft.
当心的热气球和广告牌，能带给你的飞机。
Men first went up into the air in balloons.
人们最初上升到空气中是在气球中。
Balloons suspend easily In the air.
气球容易浮在空中。
Little hot air balloons that taste like CANDY.
这种小小的热气球尝起来就像糖果一样。
There are many balloons in the air.
空中有许多气球。
Hot air balloons use ordinary air as the lifting gas.
热气球缓缓地升上了天空。
In Africa, people can watch wild animals from hot air balloons.
在非洲，人们可以从热气球上看野生动物。
Hot air balloons have burners to keep the air hot.
热气球利用装着的燃烧器保持球内气体的热度。
Hot air balloons have burners to keep the air hot.
热气球利用装着的燃烧器保持球内气体的热度。
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