automatic dialing unit

例句：

1. 1. The automatic dialing unit is used to make long-distance calls.
   自动拨号单元用于长途电话。
2. 2. The automatic dialing unit was designed for easy operation and convenience.
   自动拨号单元设计用于易于操作和方便。
3. 3. The automatic dialing unit can be programmed to dial a specific number based on the user's input.
   自动拨号单元可以根据用户的输入进行编程，以拨打特定的号码。