serially reusable program

例句：

1. 1. The programwas designed to be serially executed.
   这个程序被设计为可以连续执行。
2. 2. Theyworked in serial order, starting with themost difficult tasks first.
   他们按照顺序工作，先从最难的任务开始。
3. 3. The movieis set in a serially built city.
   这部电影的背景是一个按顺序建造的城市。