Thereupon means happening immediately after something else has happened and usually as a result of it.
例句
Some months ago angry demonstrators mounted a noisy demonstration beneath his window. His neighbours thereupon insisted upon more security.几个月前，愤怒的示威者在他的窗下发起了闹哄哄的抗议活动，随后他的邻居们坚决要求加强安全防范。
英汉词典释义
adv.
<正>因此;于是
Thereupon, we knew, our endeavor was valuable.于是，我们知道，我们的努力是有价值的！
<正>立即;随即
He thereupon asked her to marry him.他随即向她求婚。The police arrived. Thereupon the mob scattered.警察来了,这群乌合之众也随之散去。
在其上
The knight carried a shield with a cross painted thereupon.骑士拿着绘着十字的盾牌。
英英词典释义
Adverb
1. immediately after that;
"thereupon the entire class applauded""with that, she left the room""I therewith withdraw my complaints"