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1. Oxford American Dictionary

   switch on

   • ph.
     start the flow or operation of something by means of a valve, switch, or button
2. • 相關詞

   switch something on

   • ph.
     turn on an electrical device

   Oxford American Dictionary

   switched-on

   • adj.
     aware of what is going on or what is up to date: your shortcomings will be apparent to a switched-on youngster

   Oxford Dictionary

   switch something off (or on)

   • ph.
     turn an electrical device off (or on)

   Oxford Dictionary

3. • 更多解釋

   switch on

   • ph.
     start the flow or operation of something by means of a tap, switch, or button

   Oxford Dictionary