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Teacher:
How much is two minus two? 
二减二等于多少？
Chuck:
Four？
四吗？
Teacher:
Two plus two equals four.
二加二等于四。
Teacher:
For example, you put two coins in your pocket. And there is a hole in your pocket. What is left in your pocket?
比如说，你在你的兜里放了两个硬币，但是兜漏了一个洞，你兜里还剩下什么？
Chuck:
A hole.
一个洞。