upon

preposition

/əˈpɒn/

/əˈpɑːn/

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(formal, especially British English) = on
- The decision was based upon two considerations.这一决定基于两种考虑。
Although the word upon has the same meaning as on, it is usually used in more formal contexts or in phrases such as once upon a time and row upon row of seats .
… upon…
used to emphasize that there is a large number or amount of something（强调数目或数量大）
- mile upon mile of dusty road绵延数英里尘土飞扬的道路
- thousands upon thousands of letters成千上万封信件

Word OriginMiddle English: from up + on, suggested by Old Norse upp á.

Idioms

once upon a time

used, especially at the beginning of stories, to mean ‘a long time ago in the past’（用于故事的开头）从前，很久以前
- Once upon a time there was a beautiful princess.从前，有一位美丽的公主。

(almost) upon you

if something in the future is almost upon you, it is going to arrive or happen very soon近在咫尺；即将来临
- The summer season was almost upon them again.转眼间他们又要过夏天了。

upon

Prepositions: aboard, against, amid...

After another event or time: after, following, since...