有时它的一拨号，有时是其他的，有时它的两个。
Sometimes it's one dial, sometimes it's the other, and sometimes it's both.
你如果给别人打电话，一拨号，电话公司的计算机应该就能够辨认这个号码是谁的。
Phone company computers would recognize who the number was when someone dialed it and rang that person.
你如果给别人打电话，一拨号，电话公司的计算机应该就能够辨认这个号码是谁的。
Phone company computers would recognize who the number was when someone dialed it and rang that person.
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