serial bit string

例句：

1. 1. The serial numbers on the clock are in order.
   钟表上的序列号是有序的。
2. 2.They worked on a series of projects over the course of several months.
   他们在几个月的时间里完成了一系列的项目。
3. 3. The team followed a sequential approach to solving the problem.
   团队按照顺序的方法来解决问题。