Likewise for mass, we will take a chunk of some material and we will call it a kilogram.
质量也是这样,我们找来一大块材料,然后称它为 1 千克
耶鲁公开课 - 基础物理课程节选
And as you'll see by your handout, I've attempted tend to trace it.
你们可以看看课堂材料,我尝试着去找,了找它的起源,我能找到。
麻省理工公开课 - 计算机科学及编程导论课程节选
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