The simplest use case for the vending machine is the maintenance interface.
自动售货机最简单的用例是维护接口。
System friendly interface, easy to use, can also be easily extended to upgrade and maintenance.
系统界面友好，使用方便，也可以方便地进行维护升级和扩展。
This system has simple operation, nice interface, convenient maintenance and practical value.
此套系统操作简单、界面友好、维护方便，具有很好的实用价值。
This system has simple operation, nice interface, convenient maintenance and practical value.
此套系统操作简单、界面友好、维护方便，具有很好的实用价值。
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