*BOUNDARY_PRESCRIBED_MOTION_OPTION1_{OPTION2 } (*边界_规定_运动_选项1{OPTION2})
Available options for OPTION1 include:
(选项1的可用选项包括：)
NODE (节点)
SET (集合)
SET_BOX (体集合)
RIGID (刚体)
RIGID_LOCAL (刚体_局部)
OPTION2 allows an optional ID to be given that applies either to the single node, node set or a rigid body:
(选项2允许提供适用于单个节点、节点集或刚体的可选ID：)
ID
If a heading is defined with the ID, then the ID with the heading will be written at the beginning of the ASCII file, BNDOUT.
(如果标题是用ID定义的，那么带有标题的ID将写入ASCII文件BNDOUT的开头。)
注：BNDOUT(作用：Boundary Condition forces and energy)参考database ASCII
Purpose:Define an imposed nodal motion (velocity, acceleration, or displacement)on a node or a set of nodes.Also velocities and displacements can be imposed on rigid bodies. If the local option is active the motion is prescribed with respect to the local coordinate system for the rigid body (See variable LCO for keyword*MAT_RIGID).Translational nodal velocity and acceleration specifications for rigid body nodes are allowed and are applied as described at the end of this section. For nodes on rigid bodies use the NODE option. Do not use the NODE option in r-adaptive problems since the node ID's may change during the adaptive step.
(用途：定义在一个或一组节点上施加的节点运动（速度、加速度或位移）。速度和位移也可以施加在刚体上。如果“局部”选项处于激活状态，则根据刚体的局部坐标系指定运动（请参见关键字*MAT_RIGID的变量LCO）。允许刚体节点的平移节点速度和加速度规范，并按照本节末尾所述进行应用。对于刚体上的节点，请使用“节点”选项。请勿在自适应问题中使用节点选项，因为在自适应步骤中节点编号可能会
更改。)
The following card is read if and only if the ID option is specified. The second card is required.
(当且仅当指定了ID选项时，才会读取以下卡片。第二张卡片是必需的。)
For the SET_BOX option, define the following additional card
(对于定义BOX选项，定义以下附加卡)
Card is required if DOF=9,10,11 on the first card or VAD=4. If DOF<9 and VAD<4, skip this card.
(如果第一张卡片上的自由度=9,10,11或Velocity/Acceleration/Displacement=4，则需要该卡片。如果自由度<9且Velocity/Acceleration/Displacement<4，则忽略此卡片。)
VARIABLE(变量) DESCRIPTION(说明)
option是什么意思啊