upon

US /əˈpɑːn/

UK /əˈpɑːn/

在...上, 基于

more formal term for on, especially in abstract senses

•

The decision was based upon careful consideration.

该决定是基于仔细考虑而作出的。

•

He placed the book upon the table.

他把书放在桌子上。

一...就, 在...之后

indicating a time immediately or very soon after something

•

Upon arrival, please report to the front desk.

抵达后，请到前台报到。

•

He started crying upon hearing the news.

他一听到这个消息就哭了。