[liǎo fà cuī kū]   

燎    发    摧    枯    燎发：火烧毛发；摧枯：折断枯木。比喻消灭敌人极容易。

解释 燎发：火烧毛发；摧枯：折断枯木。比喻消灭敌人极容易。

as easy as burning hair and crushing dry weeds

燎发摧枯    燎如观火    燎原烈火    燎若观火