在另一款游戏中，车子只能前后移动。

In the other game the cars can only move forward and back.

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当合金流进连接处时，要前后移动火焰。

Move flame back and forth as alloy is drawn into joint.

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用滑鼠前后移动小人，画出其运动轨迹。

Move the little man back and forth with the mouse and plot his motion.

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这是因为它们的耳朵可以前后移动来捕捉声音。

This is because they move their ears forward and backward to catch sounds.

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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.

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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.

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