每日商務英語 第603期:要點

nuts and bolts --------- 基本細節，要點（非正式）

英文釋義
(INFORMAL) The BAsic, sometimes mundane but essential aspects of any operation; practical facts about how something works, often used in contrast with theoretical knowledge. (NOTE:“nuts”in this usage refers to metal fasteners)

例句
In spite of having an MBA degree, when I first took over management of an actual company it took me many months to really understand the nuts and bolts of the business.
儘管擁有MBA學位，當我第一次擔任一家實際企業的管理職務時，我還是花了好幾個月時間才真正理解了商業的要點。