[語境展不]閱讀下面句子，并試著歸納puzzle的意思及用法。

1. My sister likes doing crossword puzzles.

2. Scientists have been trying to solve this puzzle for years.

3. The findings of the survey puzzle me — they’ re not at all what I could have expected.

4. Susan' s been puzzling about / over this strange letter for weeks.

[自我歸納]puzzle既可作名詞,也可作動詞。

★作名詞時，意為:①謎，智力游戲(句1) ;②難題，謎般的事物(句2) 

★作動詞時，意為 “”,常用于以下結構:puzzle sb.使某人困惑

(句3) ; puzzle about / over sth.苦苦思索，仔細琢磨(句4) 。

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