英语翻译：
【经】 base period; basic period; origin period
例句：
- 平价制度为保证在选定的基期内农民具有相同的购买力而主要由政府支持的农产品价格水平
A level for farm-product prices maintained by governmental support and intended to give farmers the same purchasing power they had during a chosen base period.
分词翻译：
基的英语翻译：
base; basic; foundation; key; primary; radix
【化】 group; radical
【医】 base; basement; group; radical
期的英语翻译：
a period of time; expect; sheduled time
【化】 term
【医】 period; phase; stadia; stadium; stage; time
【经】 term