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key n. answer, solution.
[Discrimination] mainly refers to the answers to exercises, difficult questions, etc.
[Example] Check your answers in the key at the back of the book.
Check your answers with the solutions at the back of the book.
I don't know the key to the puzzle.
I don’t know the answer to this riddle.
answer n. answer.
[Analysis] refers to the answers to test questions, competition questions, etc., and can also refer to the solution to a certain problem.
(Example) the answer to rising crime
Solutions to rising crime rates
What is the answer to question 5?
What is the answer to question 5?
Having all the figures she figured out the answer quickly: it was 249.
With all these numbers, she quickly figured out the answer was 249.
solution n. Solution.
[Analysis] refers to the method of solving problems and problems, and can also refer to the answers to practice questions, competition questions, etc., and can often be used interchangeably with answer.
(Example) It seems to me the best solution／answer.
This seems to me to be the best solution.
It's difficult to find a solution/an answer to the problem.
It is difficult to find a solution to this problem.
The solutions/answers to the problems are on page 258.
The answer to the question is on page 258.
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