Divers must bring extra breathinggas when they'll have to struggle against a siphoning tide.
由于水流的虹吸现象，潜水员需要携带额外的氧气来对抗这种阻力。
2
I've seen people do breath control with gas masks whose rubber edges conform to the face and seal well, regulating the bottom's access to air through the breathing hose.
我见过一些人戴防毒面具，密封完好，施虐方通过控制面具下方的呼吸管来进行游戏。
3
The gas would have the dual effect of choking air-breathing animals and preventing sunlight from reaching Earth's surface.