This button is a three-wayswitch; it highlights items that are bound to the data model, items that are not bound to the data model, or no items.
该按钮是一个三向开关；它可以高亮显示绑定到数据模型的项目、未绑定到数据模型的项目或者无项目。
2
They were approached by psychologists at three US universities searching for a way to switch the apparent gender of volunteers talking to each other through video conference software.
Voltage detect of three phase AC, the warning of over-voltage, under-voltage, lost phase and power failure, two-way AC circuits switch full-automatically.