The robot stands on four small wheels.

机器人靠四个小轮子站着。

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It's small, and it's the type you can pull along on wheels.

它很小，是那种可以用轮子拉的车。

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Side guide system: with multiple roller wheels of small diameter.

侧规系统：多个小直径辊轮的固定侧规。

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Side guide system: with multiple roller wheels of small diameter.

侧规系统：多个小直径辊轮的固定侧规。

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