The robot stands on four small wheels.
机器人靠四个小轮子站着。
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。
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。
At last, I found a small piece of shadow, under innumerable wheels.
终于，我找到第一片影子，在无数的车轮下面。
At last, I found a small piece of shadow, under innumerable wheels.
终于，我找到第一片影子，在无数的车轮下面。
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