This can make crossing roads extremelyhazardous, and also makes it hard to hear conversations in noisy rooms.
他们很难判断声音的确切来源，过马路时非常危险，在吵闹的房间里听别人的谈话也很困难。
2
A thin, nearly invisible coating of ice, as on the surface of a road or a sidewalk, that is usually caused by freezing mist and is extremelyhazardous.
一层很薄的，几乎看不见的冰层，如在道路或人行道上，通常由霜雾造成，极危险。
3
For laboratory work, Marburg virus has been classified as an extremelyhazardous pathogen and can be handled safely only in specialized high-containment laboratories.