单词：rational index
rational index的用法和样例：
例句
- That theory is concerned with rational functions instead of just polynomials.该理论所研究的是有理函数而不仅是多次式。
- A rational range is the set of all fractions from a minimum fractional value through a maximum fractional value.有理范围是指从最小分数值到最大分数值的所有分数的集。
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