dial marker

例句：

1. 1. The dial marker on the phone is used to indicate the number of digits in a telephone number.
   电话上的拨号标记用来指示电话号码中的位数。
2. 2. The dial marker was replaced by a new technology that made it easier for people to use their phones.
   新的技术被用来替换拨号标记，使人们更容易使用他们的手机。
3. 3. The dial marker was designed to make it easier for people to enter numbers into their phones.
   拨号标记的设计是为了使人们更容易将数字输入到他们的手机上。