the four fundamental operations of arithmetic
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广义区间数的算术四则运算有广泛应用。
The arithmetic operation of the general interval Numbers has wide applications.
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四则运算是数学的基础。
The four operations are the basis of math.
今天，已经撰写了四则“心情随笔”，心情很好。
Today, has written four "mood Essay," a good mood.
四则是一个汉语词语，拼音是sì zé，意思是算数里指加、减、乘、除四种方法。
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