series electron

例句：

1. 1.The movie has a series of plot twists that keep you guessing.
   这部电影有一系列的情节转折，让你猜不透。
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. They organized a series of lectures on environmental protection.
   他们组织了一系列关于环境保护的讲座。