真分数

例句：

1. 1. The problem is that the truefraction of the population that can be reachedby the vaccine is very small.
   问题在于，可以通过疫苗接触到的总人口的真实分数非常小。
2. 2. In mathematics, a truefraction is a fraction whose numerator anddenominator are both positive integers.
   在数学中，真分数是分子和分母都是正整数的分数。
3. 3.The ratio of the number of students tothe total number of students in the schoolis a true fraction.
   学校学生总数与在校学生数的比例是一个真分数。