Pressing roll driven by motor directly, it with tracking and then start.
压紧辊启动由电动机直接驱动，并且具有跟踪再启动功能。
All they had were two buttons. Pressing one would roll the snake closer.
实验参与者手中有两个按钮：按下其中一个按钮会让蛇离得近些，而按下另一个按钮会让蛇离得远些。
All they had were two buttons. Pressing one would roll the snake closer.
实验参与者手中有两个按钮：按下其中一个按钮会让蛇离得近些，而按下另一个按钮会让蛇离得远些。
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