HM-4610: Using Curves, Beams, Rigid Bodies, Joints, and Loads in LS-DYNA

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在练习HM-4610时候，第11步需要生成beam，不懂在哪里选择节点，请做过练习的朋友告诉下，4和5是选择哪个地方的节点？谢谢
我先把这个例子做完整，到这一步不知道选哪个节点，教程里面的描述似乎不是很清楚。谢谢大家

Step 11: Create the beam
1.To open the Bars panel, click Mesh > Create > 1D Elements > Bars from the menu bar.
2.Under orientation, click the switch and select node.
Note:You will select a direction node later to define the beam’s section orientation.
3.Activate the Node A selector.
4.Select the center node of the left nodal rigid body for Node A. HyperMesh activates the Node B selector.
5.Select the center node of the right nodal rigid body for Node B. HyperMesh activates the direction node selector.

6.Select any non-center node of one of the nodal rigid bodies. HyperMesh creates the beam.

7.Click return.