动力学，一个物体与内部一个点做耦合，在边界条件的位移选项中对这个耦合点设置六个自由度，结果只有旋转没用平移，警告中显示：The option *boundary,type=displacementhas been used; check status file between steps for warnings on any jumps prescribedacross the steps in displacement values of translational dof. For rotational dof make sure that there no such jumps.all jumps in displacements across steps are ignored.百度的说得保证转动自由度没用突变，这该怎么修改呢？想让他既空间移动又有旋转。