Because it's dangerous
危险───DANGER;很───very
It seemed to him that western civilization was in grave economic and cultural danger.───在他看来，西方文明似乎陷入严重的经济和文化危机。
All roads are blocked by the heavy snowfall. The passengers are in danger.───所有道路均被大雪所阻塞, 旅客处于危险之中.
The daring climbers laugh at danger.───勇敢无畏的登山者在危险面前泰然自若.
There is a danger of serious contamination from radioactive waste.───放射性废弃物有严重污染的危险.
The people are in danger; we must help them off.───人们处境危险, 我们必须帮助他们离开.
We have been withdrawn from the danger area.───我们已经撤离危险地带.
He looks about him, sensing danger.───他环顾四周，觉察到了危险。
At one point he was in danger of being lynched.───他一度险些被人以私刑杀害.
Danger itself is the best remedy for danger.
I cautioned him against the danger.
The sheep dog protects the sheep from danger.
His first instinct was to run away from danger.
What is not wisdom is danger.