fundamental unit
柯林斯词典
1. N one of a set of unrelated units that form the basis of a system of units. For example, the metre, kilogram, and second are fundamental units of the SI system 基本单位; 如：米、千克和秒是国际单位制系统的基本单位
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1. N one of a set of unrelated units that form the basis of a system of units. For example, the metre, kilogram, and second are fundamental units of the SI system 基本单位; 如：米、千克和秒是国际单位制系统的基本单位