在……上面：表示某物位于另一物体的表面或顶部。
关于，对于：表示对某个主题或问题有了解或熟悉。
根据，按照：表示根据某个标准或规定进行行动。
upon /əˈpɒn/ CET4 TEM4
介词 If one thing is upon another, it is on it. 在…上
He set the tray upon the table.
他把盘子放在桌上。
He bent forward and laid a kiss softly upon her forehead.
他俯下身，在她的前额温柔地吻了一下。
介词 You use upon when mentioning an event that is followed immediately by another event. 一…就
The door on the left, upon entering the church, leads to the Crypt of St. Issac.
一进入教堂,左侧的门就通往圣以撒之墓。
介词 You use upon between two occurrences of the same noun in order to say that there are large numbers of the thing mentioned. …又…
Row upon row of women surged forwards.
一排又一排的妇女向前涌去。
介词 If an event is upon you, it is just about to happen. 即将发生
The long-threatened storm was upon us.
那场预示已久的暴风雨即将来临。
The wedding season is upon us.
婚礼旺季即将来临。
being up to particular standard or level especially in being up to date in knowledge
同义词： abreast(p) / au courant / au fait
根据；接近；在…之上
... up and down 上上下下；到处；前前后后；来来往往 up on 熟悉；精通 up until 一直到…为止 ...
... put-put 砰砰声 put-up on 被欺骗的 put-up 密谋的 ...
... up in 熟悉, 精通 up on 熟悉, 精通 up there 在那里, 在天上 ...
熟悉；精通
I'll write it up on the board.
我会把它写在黑板上。
The figures flash up on the scoreboard.
数字在记分牌上闪亮。
He spewed up on the pavement.
他在人行道上吐了。
Louie Zamperini and pilot Russell Allen Phillips survived forty-seven days at sea before their raft washed up on an island.
VOA : special.2011.05.04
And that's also how people find ways to break the second law, because somehow they've messed up on what their system is.
这就说明了某些人是如何想到办法,“打破“第二定律的，因为他们以各种方式搞错了,他们的系统的定义。
热力学与动力学课程节选 : 麻省理工公开课
because when you're up on that point, you see anything that's in the water, anything close to the surface and,
因为当你站在那里的高处，你能看到贴近水面的一切，而且，
SpeakingMax英语口语达人 : 圣莫尼卡之景点
"What was it like up on stage?" "It was pretty fun. I was mostly chopping because I'm not good with chords.
VOA : special.2010.08.20
If you stand under a skylight in the Visitor Center, you can see the bronze statue of Freedom high up on the dome outside.
VOA : special.2010.01.27
If you are visiting for business, you will find pleasure sneaks up on you.
The stocks of companies reporting earnings surprises often jump up on the day of the report.
In the unlogged areas, they didn't find many broken branches piled up on the ground.