气球的优点是它比航天飞机或火箭便宜。
The advantage of the balloon is that it will be cheaper than a space plane or rocket.
此时放手，气球会向此方向飞出，火箭就是照这个思路设计出来的。
And therefore, when you let it go the balloon will go in this direction which is the basic idea behind the rocket.
航空摄影的支持平台包括固定翼机、直升机、热气球、小型飞艇、飞船、火箭、风筝、杆子、降落伞和车载撑杆。
Platforms for aerial photography include fixed-wingaircraft, helicopters, balloons, blimps and dirigibles, rockets, kites, poles, parachutes, vehicle mounted poles .
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