operation elements的用法和样例：
例句
- The key technological operation in the process of soft full grain calfskin upper leather was discussed in this paper.
介绍了牛犊全粒面软鞋面革的特点和制作过程中的技术操作要点。 - This article summarized the experimental technology and operation outline of the paper electrophoresis for amino acid based on abundant experiments.
摘要在大量实验的基础上总结出氨基酸纸上电泳实验技术和操作要点。
