该机器人“看到”物体的三维激光在其前面的模型，它使用扫描的东西。
The robot "sees" the 3D models of objects based on the laser on its front it uses to scan for things.
在前面的专栏文章中，我们构建了一个用例模型，参与者在其中表示与系统交互的外部实体。
In previous columns, we have established a use case model in which actors represent external entities that interact with our system.
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