Arithmetic is where the answer is right and everything is nice and you can look out of the window and see the blue sky - or the answer is wrong and you have to start over and try again and see how it comes out this time.
算术就是答案是正确的，一切都很好，你可以往窗外看，看到蓝天——或者答案是错误的，你必须重新开始，再试一次，看看这次结果如何。
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