serial section

例句：

1. 1. The engineer designed the machine with a serial section for efficient operation.
   工程师设计了这台机器，具有一个序列段以实现高效运行。
2. 2. The scientist found that the chemical reaction occurred in a serial section of the sample.
   科学家发现化学反应发生在样本的序列段中。
3. 3. The book's chapters are organized in a serial section to make it easier to read.
   这本书的章节按序列排列，以便阅读更加容易。