Video: 0374_assemble_machinery_4
Phase transition: merge
State before: solid:non_particulate:rigid body
State after: solid:non_particulate:rigid body
Object: In the process of assembling the machinery, the first small part which is being picked up in the initial frame
目标物体: 在组装机械的过程中，位于初始帧中第一个拿起的小零件