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He wasn't sure exactly how a fox could have got into the sheep's pen.
他不是十分确定狐狸是怎么进入羊圈的。
《柯林斯高阶英汉双解学习词典》
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Close the gate of the pen properly to prevent the sheep from getting away.
把羊圈关好,防备羊群跑掉.
《现代汉英综合大词典》
