If you then wanted to connect to another city, let's say from Calcutta you wanted to call Delhi, you'd have to book something called a trunk call, and then sit by the phone all day, waiting for it to come through.
如果你想连接到其他城市， 假设你想从加尔各答打到德里， 你必须预订一种叫长途电话的服务， 然后坐在电话旁等上一整天，直到线路为你开通为止。