define well 划分明白
They define a template for instances of business objects and enable you to specify properties and relationships, as well as define custom cardinality.
业务模型为业务对象的实例定义一个模板,并让您能够指定属性和关系以及定义定制基数。
we can run the engine backward and build a refrigerator, if you've got your lecture notes from last period your 8-9, well, they're labeled 8-9 lecture notes, I made an attempt to define something which was a little bit misguided.
现在我们可以把热机倒过来,制作一台制冷机,如果你们拿出上节课的笔记,也就是8-9节,好的,他们在8-9节,当时我试着,定义了一些,有些误导你们的物理量。
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