非常危险的

A soldier leads a very precarious life.

军人过着险的生活。

Unfortunately, swine flu's infectiousness and the globalized flow of human travel make for a very dangerous combination.

不幸的是，猪流感的传染性和人员流动的全球化形成了一个险的组合。

VX is the most deadly nerve gas and Tabun is the least deadly (although still very hazardous).

VX是最致命的神经毒气，塔崩（尽管还是险的）则是毒性最小的。

It settles the nonce dangersome problem of crossing through the marshland by foot, and is simple in structure and convenient in use.

它解决了目前过沼泽地徒步穿越险的问题，且结构简单，使方便。