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in detail 是固定搭配，意思“详细地”，里面的 detail 必须用单数，并且前面也不用冠词，但有时 detail 之前可用形容词修饰，此时detail 也通常用单数形式，偶尔也可用复数形式。例如：
1. 郭杰克主编的《当代英语搭配大词典》(高等教育出版社，2002年11月第1版)P434-435：in complete detail十分详细地
The likeness was perfect in every detail.画像的每个微小地方都惟妙惟肖。
describe in full detail详尽地描述
I have studied this subject in great detail.我已经非常详细地研究了这个问题。
We’ll talk about it in more detail later on.我们以后再更详细地谈论它。
He described the event in graphic detail .他详细而生动地描述那件事。
treat a topic in minute detail极其详尽地论述一个问题
2. (日)市川繁治郎主编的《英语搭配大辞典》(外语教学与研究出版社2006年10月第1版)P492：
explain in clear detail
in complete detail
I want you tell me in exact detail what happened next.
I had to listen over and over again and in excruciating detail to her account of her trip to
describe …in full detail
in fuller detail
He has studied this subject in great detail.
describe …in greater detail
She recounted in harrowing detail how the boat had capsized and how she had then watched her companions die one by one.
recount.. in lurid detail
It was described in meticulous detail
discuss…in microscopic detail
Only in minor details do I find fault with his research.
He investigated the matter in minute detail.
Will you please go into it in a little more detail?
The novel describes the horrors of life there in realistic detail.
I replied in some detail to her questions.
study…in sufficient detail
Discuss the point in greater detail.
We shall come back to this in more detail later;…
This book considers the affair in all its details.
3. (日)田中茂范等主编 杨文江等译的《外研社英汉多功能词典》(外语与教学研究出版社2008年7月第1版)P563:
Could you explain in more detail?
4. Longman Dictionary of Contemporary English(English•Chinese) (Forth Edition) (光盘版): detail1 词条：This issuewill be discussed in more detail in Chapter 5.
5.《牛津高阶英汉双解词典》(第7版)(商务印书馆 2009年) P544:
This issuewill be discussed in more detail in the next chapter.