Video: 0371_assemble_machinery_1
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 second and third small parts which are being picked up in the initial frame
目标物体: 在组装机械的过程中，位于初始帧中第二三拿起的小零件