The user interacts with the program through the front panel.
通过前面板实现用户与程序的接口。
In the Control Panel, click User Accounts and Family Safety.
在控制面板，单击用户帐户和家庭安全。
A user can change the program by operating the keys on the control panel.
用户通过操作控制面板上的按键更改程序。
A user can change the program by operating the keys on the control panel.
用户通过操作控制面板上的按键更改程序。
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