The hub handles about one-third of Russian gas passing to Western Europe through Ukraine.

该枢纽处理经由乌克兰输往西欧的俄罗斯天然气的大约三分之一。

Graham was interested in how fast the gases pass through the barrier.

格雷厄姆对气体通过屏障的速度有多快很感兴趣。

That’s because it has a super low permeability: the rate at which it lets liquid or gases pass through it.

那是因为它具有超低的渗透率：它让液体或气体通过它的速率。