reference period的用法和样例：
例句
- This year the company wants to use a basis period different from that used in past years.
今年公司希望采用一个有别于以往的评税基期。 - This research focusses on the index system establishment of multi-factors which sets the factors of the same measurement in the same period in a fixed base period.
本文对多因素指数体系编制采取了将同度量因素所属时期一律固定在基期。
