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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