| 单词 | base period |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔parity〕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.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美国传统〔price index〕A number relating prices of a group of commodities to their prices during an arbitrarily chosen base period.物价指数：一组商品的有关价格相对某个指定的基数时期价格的指数美国传统 |
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