如果语句不设置一个系统字段的值，则它只能作为一个读取位置的操作数来使用。
A system field should only be used as an operand at a read position if its content is not set by the same statement.
声控分拣系统引导操作员到货物的存放位置，告知需要拣取的货物型号，并通过读取位置码和复核货物数量，以核实分拣作业的正确性。
Voice-activated picking directs the picker to the location, tells the number of each item to pick, and verifies the pick by reading the location number and repeating the count.
不过，CLI确实使一件事变得更加简单：找到错误消息，以便可以在第一位置读取这些错误消息。
However, the CLI does make one thing much, much easier: finding the error messages so you can read them in the first place.
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