... video tape recorder monitor 视带录像监视器 video track monitor 图像磁迹监视器 black out of video signals 视频信号熄灭 ...
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video track monitor
视频跟踪监视器
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Teachers, meanwhile, can monitor whether students have watched the video and keep track of their progress.
FORBES: TED-Ed Hits the Classroom with New Video Website
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