This is the 5674th most frequent Chinese word.
单元
"单元" means "unit" (as in a section, module, or component).
Here, '单元' refers to a unit within a residential building, commonly understood as sections or blocks of the building.
这个小区有很多单元,每个单元都有不同的布局。
This neighborhood has many units, each with a different layout.
In this context, '单元' is associated with an academic or syllabus-related segment, referring to a subsection of study or topic.
今天数学课我们学习了代数的一个单元。
Today in the math class, we studied an algebra unit.
Here, '单元' denotes a unit or constituent part of a larger context, in this case referring to programming structures.