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讲解文本：
cannot put one"s finger on 搞不懂，毫无头绪，一头雾水Mike cannot put his finger on his girlfriend’s emotions.Mike完全搞不懂她女朋友的情绪。I still cannot put my finger on who wrote me that card我还是不能确定那张贺年卡是谁寄来的。
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