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Thereupon, [clause]
Thereupon常用于句首，后接逗号，表示随后或因此发生某事。
Thereupon, the meeting was adjourned.
于是，会议被延期了。
随即；接着；立即
先理解核心含义，再看它在真实句子里的用法。
随即；接着；立即
Immediately after that; then.
Thereupon, the meeting was adjourned.
于是，会议被延期了。
正式／书面用语
在其上
Upon that; thereon.
因此；所以
In consequence, or by reason, of that; therefore.
随后；随即；紧接着(不一定因之)
Following that; forthwith; in sequence, but not necessarily in consequence.
He heard the alarm clock ring and thereupon jumped out of bed.
他听到闹钟响，随即从床上跳了起来。
The rain stopped; thereupon, we continued our walk in the park.
雨停了，于是我们继续在公园里散步。
The teacher explained the rule, and thereupon the students began to practice.
老师解释了规则，随后学生们开始练习。
Thereupon常用于句首，后接逗号，表示随后或因此发生某事。
Thereupon, the meeting was adjourned.
于是，会议被延期了。
Thereupon置于主语之后、动词之前，强调紧接着主语的动作。
The committee thereupon decided to investigate.
委员会于是决定调查。
Not this
He finished his work thereupon he left.
Use this
He finished his work; thereupon, he left.
“thereupon”是副词，不能直接连接两个句子，应使用分号或句号，并加逗号分隔。
Not this
He put the book thereupon the table.
Use this
He put the book upon the table.
“thereupon”是副词，意为“随即”，不能作介词表示“在…上面”，应用“upon”或“on”。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
随即辞职
The scandal broke, and the minister thereupon resigned.
丑闻曝光后，部长随即辞职。
随后继续进行
She finished her remarks and thereupon proceeded to the next item.
她说完后随即进行下一项。
因此成为
He inherited the estate and thereupon became a wealthy man.
他继承了遗产，因此成为富人。
接着发生
The announcement was made, and thereupon followed a moment of silence.
宣布之后，接着是一片沉默。
于是决定
They heard the full story and thereupon decided to act.
他们听完整个经过，于是决定采取行动。
Use thereupon naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
拆成 there + upon，字面“在那上面”→ 联想事情紧接着发生，记住“随即、因此”。
语域：formal 常见场景：正式文书、法律文本、学术文章、文学叙事 这是一个较正式、带书面语色彩的副词，通常多用于正式文书、法律或学术语境，表示“随即”或“因此”。日常口语中很少见，口语更常说 then、so 或 immediately after that。
通常用于正式或书面语，表示因果关系或紧接着发生。置于句首时，常用逗号隔开。
Dictionary facts from ECDICT, WIKTIONARY.