serial input-output address

例句：

1. 1.The serial number on the watch is 123456.
   手表上的序列号是123456。
2. 2.They worked in a serial of houses that were built in the 1970s.
   他们在一个建于20世纪70年代的连排房屋里工作。
3. 3. The serial numbers are all different.
   这些序列号都不同。