气球飞艇内部氦气的压力和外部气压相近，因而气体不会溢出。
The pressure of the helium inside a blimp is about the same as that of the air outside, so the gas does not rush out.
气球飞艇能在空中停留一个多星期，而多数无人机一次最多只能飞行30小时。
And they can stay in the air for more than a week, whereas most drones fly for no more than 30 hours at a time.
一只气球飞艇能收在吉普车的后箱中，等行驶到合适的地点后，安装升空只需几小时，收下来则更快捷。
A blimp can be stored in the back of a jeep, driven to a suitable location, launched in a couple of hours and winched down again even faster.
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