疾雷不及掩耳

Explanation: Suddenly thunder, make time to their ears. Metaphor to or action suddenly, makes time to prepare. 　　Usage: Complex sentence; as attribute, clause; metaphor to come suddenly, people no time to prepare 　　Source: "Military potential Tragic Hero": "good person so as not to choose, one must not hesitate clever person, so Jilei less than their ears, finally blink less electricity." 　　Examples: Or they may not get up, give them a Jilei less than their ears, took leave, and will not make an escape. (Qing Li Baojia "A Short History of Civilization," the seventh back) Thesaurus:  do stb.when people are off guard, take sb. unawares, to help a joint cause Wish watch, Surprise, The enemy is unprepared, sudden; as sudden as lightening; sudden peal of thunder leaves no time for covering ears