Common fractions written in the greek or egyptian system were too awkward for astronomical calculations . 用希腊人或埃及人那套办法写出来的普通分数很不便于作天文计算。
2.
The expression written below the line in a common fraction that indicates the number of parts into which one whole is divided 名称在公分式的分数线下的表达式，它指明了一个整个被划分的部分的数目
