提出了不等距螺旋设计中的最小极限推程问题，并进行了全面的理论分析。

The concept of minimum limit push lead (MLPL) in the design of varying pitch screw is introduced and a comprehensive theoretical analysis is carried out.

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因此，在研究生这个程次上，我们所提的问题和我们所使用的驱动宏观经济波动的结构将会改变。而我们所使用的基本工具和技术将不变。

Thus, at the graduate level, while the questions we ask and the mechanisms we use to drive fluctuations in the macroeconomy will change, the fundamental tools and techniques we use will not.

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还有一个棘手的问题便是键程。

Then there's the sticky issue of key travel.

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