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“十七八”和“十七、八”只相差一个顿号,但性质完全不同:前者是概数,后者是确数。这里有必要讲一讲顿号的作用。顿号是表
“Seventeen eight” and “seven, eight” only differ by a comma, but the nature is completely different: the former is the sum of the latter, the latter is the exact number. There is a need to talk about the role of Dayton. The comma is the table