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
It is Professor Munakata's "reverse pyramid" strategy that prevents the megaliths from being dumped atop the dome of St Paul's Cathedral from a blimp.
正是宗方教授的“逆向金字塔”策略可以防止巨石被飞艇甩到圣保罗大教堂的圆顶上。
3
The inner envelope filled with helium in the head section of the blimp and the third built-in airbag at the tail is filled with ethane combustible gas.