simulation中固定几何体怎么转化为不可移动

固定几何体作为夹具的一个固定选项，但是不可移动有时能看到有时却看不到。
又没人知道这个是为什么？
09版本以前的也是这样的吗？

This restraint type sets all translational degrees of freedom to zero. It is the same for shells, beams and trusses. No reference geometry is used.

To access the immovable restraint, right-click on Fixtures in Simulation study tree and select Fixed Geometry. Under Standard, select Immovable (No translation).

For solids, you cannot access the Immovable (No translation) option. The Fixed Geometry restraint however is the same as the immovable restraint for solids.

实体中没有这个命令，壳体中才有。固定几何体 和这个命令是一致的。