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在表达某个数时，只允许使用两个汉字，这两个汉字就是“万”和“亿”，但切勿忘记一个先决条件：“万”和“亿”不能同时使用。比如：6400000000000可表达为64000亿或640000000万；不可写为6万4000亿。用汉字表达数时的规范用法
When expressing a certain number, only two Chinese characters are permitted. These two Chinese characters are “10000” and “100000000”, but do not forget a prerequisite: “10000” and “100000000” Can not be used at the same time. For example: 6400000000000 can be expressed as 640000000000 or 640000000; can not be written as 6000000000. The use of Chinese characters to express the number of norms