step-by-step drilling

例句：

1. 1.We need to step-by-step drill our new software system.
   我们需要逐步训练我们的新软件系统。
2. 2. The teacher guided the students through a step-by-step drill on how to use the new tool.
   老师指导学生通过逐步练习如何使用新工具。
3. 3.The project required us to step-by-step drill through each stage of development.
   这个项目要求我们逐步练习每个开发阶段。