英语语法分析

More often , all of the materials etchant have a finite etch rate.

剂中的材料都具有一定的刻蚀速率。

More often, all of the materials exposed to the etchant have a finite etch rate.

通常，所有暴露在刻蚀剂中的材料都具有一定的刻蚀速率。

It was relative to the etching depths, temperature and the etchant proportion and types.

凸角侧向腐蚀程度与腐蚀深度、腐蚀温度、腐蚀剂配比等诸多因素有关。