nuts and bolts

She has invented a nifty little gadget for undoing stubborn nuts and bolts.

她发明了一种灵巧小工具用来松开螺母和螺栓。

If we look at the nuts and bolts of the plan, what problems are there?

如果我们探讨一下份计划基本要点，会发现什么？

He worked there for two years, long enough to learn the nuts and bolts of the business.

在那里工作了两年，已经学会了那个行业基本知识。