You always want to check your signs at the and because it's so easy to get the sign wrong, and I was hoping that it was right here because I wasn't sure, but it turned out to be right.
我们完成计算时,一定要记得检查符号,因为很容易弄错符号,刚才我就不太确定,是否弄错了符号,检查发现没有问题。
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