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n (1)難題，難以理解或回答的問題，難解之謎 (question difficult to understand or answer; mystery) [C， 通常sing]： The murder case was a～to the detective. 那件謀殺案對偵探來說是個難題。Her decision was a～to me. 她的決定我很難理解。the～of how life began 生命起源之謎;The motives of the film-makers remain a～. 電影制片人的動機(jī)仍然是個謎?！纪絤ystery，problem，riddle;

(2)測驗智力的游戲或玩具(kind of game or toy to test sb's thinking， knowledge or skill) [C] (常用于合成詞)： crossword～s 縱橫字謎;a jigsaw～拼圖玩具;find the answer to/solve a～猜出謎底/解開一個謎;set a～for sb (set sb a～) 給某人猜一個謎;a book of～s 謎語書;

v (1)使困惑(苦思) (cause (sb) to think hard)[T+n]： His reply/Something in his voice/His recent behaviour～d me. 他的回答/他聲音里的某種東西/他最近的行為使我困惑不解。be～d by sb's failure to reply/refusal to help 由于某人未作回答/拒絕給予幫助而困惑不解;The murder case continue to～the police. 那件謀殺案仍使警察感到困惑不解?！玱ne's brains to find the answer/about sth 絞盡腦汁尋找答案/為某事大傷腦筋;be～d about what to do next/how to react 不知下一步該做什么/如何作出反應(yīng);〖同〗confuse;

(2)苦苦思考(think deeply about sth in order to understand it) [I+prep (over)]：～over a problem/one's arithmetic/sb's strange behaviour/sb's strange letter for several hours對一個問題/算術(shù)題/某人奇怪的行為/某人奇怪的信苦苦思考了幾個小時;I've been～ing over how the dog got into the house. 我一直在苦苦思考那狗是怎么進(jìn)屋的。

(3)苦思而解決，設(shè)法想出 (find the answer to sth by thinking hard) [T+n+adv(out)]：～out the answer to the problem/the meaning of the cypher 思考出問題的答案/密碼的意思;I've tried for hours to～out what could have made him so angry that he hasn't written to us. 我想了好幾個小時，終于想出了可能使他生氣而不給我們寫信的原因。

→′puzzled adj 迷惑不解的;′puzzler n 令人迷惑不解的人或物;′puzzlement n 困惑;′puzzling adj 令人迷惑不解的