step by step system

例句：

1. 1. We need to follow the instructions step by step to complete the project.
   我们需要按照指示一步步完成这个项目。
2. 2. She taught me how to cook step by step, from scratch.
   她教我如何从零开始一步一步地做饭。
3. 3. The teacher demonstrated a new technique step by step.
   老师一步一步地演示了一种新的技术。