series of lines

例句：

1. 1. The book has a series of chapters that are easy to follow.
   这本书有一系列章节，容易跟随。
2. 2. The scientist conducted a series of experiments to test the hypothesis.
   科学家进行了一系列的实验来测试这个假设。
3. 3.After the rain, the river flows in a series of small tributaries.
   雨后，河流沿着一系列小支流流动。