bore stroke ratio

例句：

1. 1.The engineer used a bore stroke ratio of 0.5 to achieve the desired depth.
   工程师使用了0.5的钻孔比例来达到所需的深度。
2. 2. The drilling process requires careful adjustment of the bore stroke ratio to avoid damage to the material.
   钻探过程需要仔细调整钻孔比例，以避免对材料造成损害。
3. 3. The tool's design optimizes for high bore stroke ratios, making it ideal for drilling through thick materials.
   该工具的设计优化了高钻孔比例，使其非常适合钻透厚材料。