dangerous: applies to whatever may cause loss or harm unless dealt with carefully: soldiers on a ~ mission.


hazardous: implies great and continuous risk of harm or failure and small chance of successfully avoiding disaster: claims that smoking is ~ to your health.


precarious: suggests insecurity and uncertainty resulting from danger or hazard: has only a ~ hold on reality.


perilous: strongly implies the immediacy of danger: the situation at the foreign embassy has grown ~.  (immediate直接: 之间没有任何其他东西)


risky: often applies to a known and voluntarily accepted danger: shy away from ~ investments.  (shy away回避，避开:Alan doesn't shy away from controversy艾伦不回避争议 )


dangerous危险: 泛指任何可能造成损失或伤害的事物，hazardous危险: 可能造成严重持久伤害，难免灾难，precarious不安全: 由此造成的不安全不确定，perilous危急: 强烈表示迫在眉睫危在旦夕，risky风险: 是已知的、自愿接受的危险


记忆方法: 1) 首字母排序成HRDPP忽然地攀爬<==危险

          2) 危险的意思是可能造成损失或伤害的mean bringing or involving the chance of loss or injury.首字母排序成HRDPP忽然地攀爬<==危险