Only once we've done that can we really move forwards.
只有当我们做到了我们才能前进。
Sometimes they seem to move backwards for a time and then forwards again.
它们时而往前时而向后。
He loved to move people forwards.
他喜欢推动人们向前。
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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