This means that you can combine model elements of a given type into units that, in turn, you can use as the building blocks to be combined in the same way at the next level of abstraction, and so on.
这就意味着，你可以把一个给定类型的模型元素合并到单元里，依次类推，你可以用这种方式在下个抽象层面上进行合并，并把这些合并后的单元作为一个模块进行使用。
The internal space of units on the upper floors may be slightly larger than those of the same type on the lower floors due to reduced thickness of structural walls on those upper floors.
层楼较高单位由于结构墙较低层单位稍薄，因而室内空间或会稍为增多。
The internal areas of units on upper floors may be slightly larger than those of the same type on lower floors due to the reduced thickness of structural walls or columns on upper floors.
高层单位之结构墙或柱较低层单位之结构墙稍薄，因而室内面积或会稍为增多。
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