operation elements的用法和樣例：
例句
- The key technological operation in the process of soft full grain calfskin upper leather was discussed in this paper.
介紹了牛犢全粒面軟鞋面革的特點和製作過程中的技術操作要點。 - This article summarized the experimental technology and operation outline of the paper electrophoresis for amino acid based on abundant experiments.
摘要在大量實驗的基礎上總結出氨基酸紙上電泳實驗技術和操作要點。
