1、The contract performance covers a 6 month base period with four one-year option periods.
合同日期包括6個(gè)月的基本期和四個(gè)為期一年的選擇期。

2、The contract has a four-month base period and three one-year options.
該合同有一個(gè)4個(gè)月的基本期和3個(gè)一年的選擇。

3、The contract includes a base period of five years with one five-year option.
該合同包括一個(gè)5年的基本期和一個(gè)5年期選項(xiàng)。

4、The system uses base period wages to calculate MBA.
系統(tǒng)使用基本工資周期來計(jì)算MBA。

base period翻譯