step by step design的用法和样例：
例句
- Blact hole cxplesion in a confed condition within tunneling is analysized,a stage-by-stage blast hole design theory and the related paraameters are presentes.
对掘进中处于夹制情况下的炮孔爆破进行分析，提出炮眼分阶段设计的原理及有关的参数。 - The interface contract between the portal and each system is designed and documented during the design phase of your methodology.
门户和每一个系统之间的接口约定是在方法的设计阶段设计和记录的。
