"In which"强调在某个特定的事物或情况中。"For which"强调为了某个特定的目的或原因。"On which"强调在某个特定的对象或事物上。"At which"强调在某个特定的地点或位置上。它们在释义、用法、使用环境、影响范围和形象上存在一些区别，具体内容如下所示。
1. 释义区别：
"In which"表示在某个特定的事物或情况中。"For which"表示为了某个特定的目的或原因。"On which"表示在某个特定的对象或事物上。"At which"表示在某个特定的地点或位置上。
例句：
"The room in which I stayed was very comfortable."（我住的房间非常舒适。）
"She bought a present for which I am grateful."（她给我买了一份礼物，我非常感激。）
"The book on which I am reading is very interesting."（我正在读的这本书非常有趣。）
"The party will be held at which venue?"（派对将在哪个地点举行？）
2. 语法区别：
"In which"和"for which"通常用于从句中，引导一个描述或解释的定语从句。"On which"和"at which"通常用于从句中，引导一个描述或解释的副词从句。
例句：
"I visited the city in which I grew up."（我参观了我长大的那个城市。）
"He made a decision for which there were several reasons."（他做出了一个有几个原因的决定。）
"The restaurant has a balcony on which you can enjoy the view."（这家餐厅有一个阳台，你可以在那里欣赏风景。）
"He pointed to the building at which the incident occurred."（他指着事情发生的那栋楼。）
3. 用法区别：
"In which"和"for which"引导的从句通常用来提供补充信息或解释前面提到的事物。"On which"和"at which"引导的从句通常用来描述或解释前面提到的地点、位置或对象。
例句：
"She showed me her new house, in which there was a beautiful garden."（她带我参观她的新房子，里面有一个美丽的花园。）
"He organized a meeting, for which he prepared a detailed presentation."（他组织了一次会议，为此他准备了一个详细的演示文稿。）
"They built a platform on which the statue was placed."（他们建了一个平台，上面放置了雕像。）
"The movie theater, at which we watched the film, was packed with people."（我们观看电影的电影院座无虚席。）
4. 使用环境区别：
"In which"适用于各种场景，用于描述特定的事物、情况或状态。"For which"适用于正式场合或书面语，用于描述目的、原因或感激之情。"On which"和"at which"适用于正式场合或书面语，用于描述地点、位置或对象。
例句：
"The experiment, in which they tested the new drug, produced promising results."（他们进行的实验测试了新药物，取得了有希望的结果。）
"He made a suggestion, for which he received praise from his colleagues."（他提出了一个建议，因此获得了同事们的赞赏。）
"The museum has an exhibition on which they display ancient artifacts."（博物馆设有一个展览，展示古代文物。）
"The conference will be held at which leading experts in the field will give presentations."（会议将在那里举行，该领域的知名专家将发表演讲。）