series of trains running at similar speeds

例句：

1. 1. The series of books on quantum physics are fascinating.
   关于量子物理的一系列书籍非常引人入胜。
2. 2. She has a series of questions about the new policy.
   她对新政策有一系列问题。
3. 3. The series of photos document the journey of the explorer.
   这一系列照片记录了探险家的旅程。