the nuts and bolts

US /ðə nʌts ənd boʊlts/
UK /ðə nʌts ənd boʊlts/
"the nuts and bolts" picture
1.

基本細節, 核心, 實際操作

the basic practical details of a subject or activity

:
Let's get down to the nuts and bolts of the project.
讓我們開始討論專案的基本細節
He understands the nuts and bolts of how a car works.
他了解汽車工作原理的基本細節