(be cornered like) a turtle in a jar;a captive turtle in an earthen jar;(like) a rat in a hole;a sitting duck ;

We realized too late that we were caught like rats in a trap.
等我们发觉自己已成瓮中之鳖时已经太晚了。
来源:《柯林斯高阶英汉双解学习词典》
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