英语语法分析

The press fit experiments on the knurling connection were performed.

并进行了滚花连接压装试验。

Knurling. Knurling is mainly a forming operation in which no chips are produced.

滚花主要是一种不产生切屑的成型操作。

The second version also has wider and deeper knurling on the focusing ring than the previous version.

第二版调焦环上的棱比前一版更宽更深。