brain teaser
柯林斯词典
1. N-COUNT A brain teaser is a question, problem, or puzzle that is difficult to answer or solve, but is not serious or important. 脑筋急转弯; 智力题
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1. N-COUNT A brain teaser is a question, problem, or puzzle that is difficult to answer or solve, but is not serious or important. 脑筋急转弯; 智力题