Secondary sample procedures是什么意思

用法例句

Study on Secondary Seismic Acquisition in Southern Steep Zone in Biyang Depression;

泌阳凹陷南部陡坡带二次采集方法研究

Througn designing three axial slots in internal threaded portion and optimizing nib structure,a design was made on the injection mould with a two-step ejecting mechanism with non-rotating.

对笔尖内螺纹部分设计三段轴向开槽,优化笔尖结构,设计了二次推出不带旋转机构的自动脱螺纹注塑模。