main point of operation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。 - The purpose was to study the processing route and operating points of papier-mache Pteridium aquilinum processing.
為了研究紙型蕨菜加工的工藝流程及操作要點。
