当开关转变为任何变速“开启”的设置时，电流可以通过开关接到地上，继电器开启。

When the switch is turned to any of its variable speed "on" Settings, current can flow though the switch and down to earth to allow the relay to switch on.

youdao

当开关转变为任何变速“开启”的设置时，电流可以通过开关接到地上，继电器开启。

When the switch is turned to any of its variable speed "on" Settings, current can flow though the switch and down to earth to allow the relay to switch on.

youdao