You use whereupon to say that one thing happens immediately after another thing, and usually as a result of it.
例句
Mr Muite refused to talk to them except in the company of his legal colleagues, whereupon the police officers departed...缪特先生拒绝在没有其律师同事陪同的情况下和他们说话，于是警察们就离开了。'Well, get on with it then,' said Dobson, whereupon Davies started to explain.“那好吧，继续吧，”多布森说，于是戴维斯开始解释。
英汉词典释义
conj.
在这以后, 然后, 于是
He insulted her, whereupon she slapped him.他侮辱她, 于是她给了他一巴掌。
英英词典释义
Adverb
1. closely following and in consequence of which;
"the Japanese refused to import U.S. made cellular phones whereupon the U.S. imposed strict tariffs on Japanese exports"
2. upon which;
"the rock whereupon she stood"
3. in consequence of which;
"this is a statement whereat the listeners may get angry"