The train began to move backwards.
火车开始向后退。
Then the train began to move backwards.
这时火车却开始向后开动了。
Sometimes they seem to move backwards for a time and then forwards again.
它们时而往前时而向后。
Move on, for life is not meant to be traveled backwards.
要往前走，因为生命不会走回头路。
Focus on the dot in the center and move your head backwards and forwards.
将视线集中在中心的小黑点，然后前后移动你的头部，你发现了什么？
Focus on the dot in the center and move your head backwards and forwards.
将视线集中在中心的小黑点，然后前后移动你的头部，你发现了什么？
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