甕中之鱉　

◎ 甕中之鱉 wèngzhōngzhībiē

[be bottled up like a turtle trapped in a jar;be hopeless like a rat in a hole] 處于甕罐內(nèi)的鱉。比喻形勢對一方極有利,另一方則處在受制地位

敵人已成甕中之鱉,我軍穩(wěn)操勝券