Protracting object's free-body diagram is a course of analysising object's force from other object.

画受力图是解决力学问题关键的一步。

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View a Free Body Diagram of all the forces (including gravitational and normal forces).

看所有力的自由体受力图(包括重力和正向力)。

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Protracting object's free-body diagram is a course of analysising object's force from other object in fact.

绘制物体受力图的过程就是对物体进行受力分析的过程，学会画受力图是解决力学问题关键的一步。

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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

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

图表上部画的是细胞体

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