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.
气球飞艇内部氦气的压力和外部气压相近，因而气体不会溢出。
2
Moreover, they usually stay aloft even when punctured: 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.
此外，就算被刺穿了，它们通常也能留在高空：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。
3
After watching the video over and over again. I can say that a tethered blimp is out of the question.