dangerous chemicals
危險化學品
The men are armed and dangerous.
那些人攜帶武器,太危險了。
His parents won't let him play ice hockey because they think it's too dangerous.
他的父母不讓他打冰球,因為他們認為太危險。
[ + to infinitive ] It's dangerous to take more than the recommended dose.
服藥過量是很危險的。