The book opens with an account of the ins and the outs of the event.

这本书以介绍这个事件的原委开始。

youdao

He quickly learned the ins and outs of the job.

他很快就掌握了工作的全部诀窍。

《牛津词典》

Does the study mean that cats will soon grasp the ins and outs of cause and effect?

这项研究是否意味着猫很快就能掌握因果关系的详情？

youdao

And the growth of a club-within-a-club if the outs do stay out is sure to stir bad blood between the ins and the outs.

ECONOMIST: Pedro Solbes, commissioner for the euro

Most business owners try to maximize the ins and minimize the outs.

FORBES: What to Expect as an Entrepreneur

Without the beat reporters who know the ins-and-outs of the stories and communities they live in, local readers will lose important coverage.

CNN: Does local journalism have a future?