论文部分内容阅读
两只鸟老师:“这儿有两只鸟,一只是燕子,一只是麻雀。谁能指出哪只是燕子,哪只是麻雀吗?”学生:“我指不出,但
Two birds teacher: “There are two birds here, one is a swallow and one is a sparrow.” Who can tell which is a swallow and which one is a sparrow? “Student:” I can not tell but