Video: 0078_assemble_puzzle_3
Phase transition: merge
State before: solid:non_particulate:rigid body
State after: solid:non_particulate:rigid body
Object: In the process of assembling the puzzle, the puzzle piece which is being held vertically by the left hand in the initial frame
目标物体: 在拼图过程中，位于初始帧中左手握住的垂直桌面的拼图块