The free-body diagram, it says you can pick any one body that you like and apply F = ma to it, provided you identify all the forces acting on that body.

所谓隔离法,就是说你可以任意 选取一个物体,分析出它所受的所有力后,单独对其运用 F = ma 进行计算

耶鲁公开课 - 基础物理课程节选

In fact, if you draw a diagram of a person, what their body is corresponding to the amount of somatosensory cortex, you get something like that.

事实上,如果你画一张人体示意图,在这张示意图中,将躯体感觉皮层面积与身体相对应,那么你就会得到这样的一张图

耶鲁公开课 - 心理学导论课程节选

Here is the cell body up at the top of the diagram here.

图表上部画的是细胞体

耶鲁公开课 - 生物医学工程探索课程节选

One way to draw sort of a schematic diagram of the operation of the human body where it shows separated organ systems and tries to show them in context.

用这种图示的方法,示意人类身体的运作方法,图中单独表示出器官系统,并试图展示它们之间的联系

耶鲁公开课 - 生物医学工程探索课程节选