钱方如遇挡道的物体或行走的顾客，机器人身上的运动传感器可对其发出暂停指令。

They have motion sensors designed to stop when objects or people are in their way.

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而且，如果在收件箱没有可用数据，rdch指令就会一直暂停，直到可用数据出现。

And, if there is no value available in the inbox, the RDCH instruction simply stalls until there is one.

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暂停（Stall） —— 处理器不开始执行新指令处的时钟周期。

Stall -- A clock cycle where the processor does not begin a new instruction.

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