conj.因此；于是；在…上面

He didn't understand the point, whereupon I had to explain further. 他不理解這一點,因此我只得作了進一步的解釋。

One of the man insulted another, whereupon a fight broke out. 其中一個男人侮辱了另一個男人，于是他們就打了起來。

He saw me coming, whereupon he ran off in the other direction. 他看見我來了，于是就向另一個方向逃跑了。