Warning: file_put_contents(/www/wwwroot/ppbbu/73904.com/cache/661008282e6e3503db90c40349c88788.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/73904.com/index.php on line 55 fundamental unit英英字典_fundamental unit剑桥英语解释_fundamental unit柯林斯英文解释_骑士汉英词典
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 基本單位; 如：米、千尅和秒是國際單位制系統的基本單位