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老师:这儿有两只鸟,一只是麻雀,另一只是燕子。谁能指出哪只是燕子,哪只是麻雀吗?学生:我指不出,但我知道答案。
Teacher: There are two birds here, one is a sparrow and the other is a swallow. Who can tell which is a swallow, which is a sparrow? Student: I can not tell, but I know the answer.