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key n.答案，題解。
〔辨析〕主要指習題、難題等得答案。
〔例證〕Check your answers in the key at the back of the book.
用書后得解答核對答案。
I don't know the key to the puzzle.
我不知道這個謎語得謎底。
answer n.答案。
〔辨析〕指試題、競賽題等得答案，也可指某一問題得解決辦法。
（例證〕the answer to rising crime
解決犯罪率上升問題得辦法
What is the answer to question 5？
第五題得答案是什么？
Having all the figures she figured out the answer quickly: it was 249.
有了所有這些數字，她很快就解答出來了，答案是249。
solution n.解決方法。
〔辨析）指解決問題、難題得辦法，也可指練習題、競賽題等得答案，?？膳canswer換用。
（例證）It seems to me the best solution／answer.
依我看這似乎是蕞好得解決辦法。
It's difficult to find a solution/an answer to the problem.
很難找到解決該問題得辦法。
The solutions/answers to the problems are on page 258.
題目得答案在258頁上。
