What Is Left Behind?还剩下什么?Miss Ding:Jack,what is 5 minus 2?Jack:It''s 3,Miss Ding.Miss Ding:Very good!Then,how about 5 minus 5?Jack:Sorry,I don''t know.Miss Ding:Don''t worry.Let me give you an example.If you have 5 candies in your pocket,but they are all lost.What is left behind in your pocket?Jack:Only a hole.
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