{"scenario_id":"controller_desk","step":1,"t0_s":22.0,"t1_s":23.17,"zh":"双手在桌面操作区，握持深色手柄。这一小段左手追踪还没稳定。","en":"Both hands are in the desk workspace, gripping dark controllers. Left-hand tracking is not yet stable.","method":"human_keyframe_review","tracker":"left inactive, right active","not_a_detector":true,"boxes":null}
{"scenario_id":"controller_desk","step":2,"t0_s":23.17,"t1_s":25.5,"zh":"左右手同时有效，仍握持深色手柄，看向桌面终端。","en":"Both hands are active, still gripping the dark controllers and facing the desk terminal.","method":"human_keyframe_review","tracker":"both active","not_a_detector":true,"boxes":null}
{"scenario_id":"paper_cloth","step":1,"t0_s":25.5,"t1_s":27.52,"zh":"转到纸卷和布。这一小段右手追踪更稳，左手时有时无。","en":"The action moves to a paper roll and cloth. Right-hand tracking is steadier; the left hand drops in and out.","method":"human_keyframe_review","tracker":"right mostly active","not_a_detector":true,"boxes":null}
{"scenario_id":"paper_cloth","step":2,"t0_s":27.52,"t1_s":29.5,"zh":"左右手同时有效，继续操作纸卷和布。","en":"Both hands are active and continue handling the paper roll and cloth.","method":"human_keyframe_review","tracker":"both active","not_a_detector":true,"boxes":null}
{"scenario_id":"part_phone","step":1,"t0_s":29.5,"t1_s":31.2,"zh":"双手捏持小零件。","en":"Both hands hold a small part.","method":"human_keyframe_review","tracker":"both mostly active","not_a_detector":true,"boxes":null}
{"scenario_id":"part_phone","step":2,"t0_s":31.2,"t1_s":32.05,"zh":"左手持手机，看向屏幕。","en":"The left hand holds a phone and looks at the screen.","method":"human_keyframe_review","tracker":"left active at the start of this glance","not_a_detector":true,"boxes":null}