dial central office

例句：

1. 1. He dialed the number on his phone.
   他拨打了手机上的号码。
2. 2. She dialed 911 for help.
   她拨打了911寻求帮助。
3. 3. The clock dials the hour by striking the hour hand.
   时钟通过敲响时针来报时。