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PREP
到…之上；向…之上
If something moves or is put onto an object or surface, it is then on that object or surface.
例句
I took my bags inside, lowered myself onto the bed and switched on the TV...
我把包拎進屋，往床上一倒，然后打開了電視機。
Smear Vaseline on to your baby's skin to prevent soreness.
給孩子皮膚上抹些凡士林以防止腫痛。
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PREP
到（某處）
You can sometimes use onto to mention the place or area that someone moves into.
例句
The players emerged onto the field...
運動員入場了。
...when the photographer sets off onto the moors...
攝影師動身踏入高沼時
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PREP
（光線或視線）朝向,轉向
You can use onto to introduce the place towards which a light or someone's look is directed.
例句
...the metal part of the door onto which the sun had been shining...
在陽光照耀下閃閃發亮的門的金屬部分
The colours rotated round on a disc and were reflected onto the wall behind.
圓盤上色彩流轉，反射到后面的墻上。
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PREP
通向（某處）
You can use onto to introduce a place that you would immediately come to after leaving another place that you have just mentioned, because they are next to each other.
例句
...windows opening onto carved black-wood balconies...
開向黑檀雕花陽臺的窗戶
The door opened onto a lighted hallway.
這扇門通往亮著燈的走廊。
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PREP
（重心移動）到（身體某部位）上
When you change the position of your body, you use onto to introduce the part your body which is now supporting you.
例句
As he stepped backwards she fell onto her knees, then onto her face...
他向后退時，她雙膝跪倒在地，接著迎面倒了下去。
Puffing a little, Mabel shifted her weight onto her feet...
梅布爾喘了口氣，把身體重心移到腳上。
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PREP
到（交通工具）上
When you get onto a bus, train, or plane, you enter it in order to travel somewhere.
例句
As he got on to the plane, he asked me how I was feeling...
他上飛機時問我感覺如何。
Who can fold up a pushchair, toddler and shopping and then get them all onto the bus?...
誰有那本事一手收起嬰兒推車，一手抱著剛會走路的孩子，還得提著剛買的東西，然后擠上公共汽車？
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PREP
（用于 hold，hang，cling 等動詞后，表示抓緊或牢牢固定）在…上
Onto is used after verbs such as 'hold', 'hang', and 'cling' to indicate what someone is holding firmly or where something is being held firmly.
例句
The reflector is held onto the sides of the spacecraft with a frame...
反射器通過支架牢牢地固定在航天器的側面。
She was conscious of a second man hanging on to the rail...
她意識到還有第二個人緊緊抓著欄桿。
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PREP
轉到（其他話題）
If people who are talking get onto a different subject, they begin talking about it.
例句
Let's get on to more important matters...
咱們談談更重要的事吧。
So, if we could just move onto something else?
那么我們可不可以干脆談點別的？
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PREP
成為（列表、系統等）的一部分
You can sometimes use onto to indicate that something or someone becomes included as a part of a list or system.
例句
The Macedonian question had failed to get on to the agenda...
馬其頓問題沒能列入議事日程。
The pill itself has changed a lot since it first came onto the market...
該藥片本身自首次進入市場以來已經有了很大改變。
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PREP
即將發現（重要之事）
If someone is onto something, they are about to discover something important.
例句
He leaned across the table and whispered to me, 'I'm really onto something.'...
他從桌上俯過身來對我低聲說道：“我真的就快有重大發現了。”
Archaeologists knew they were onto something big when they started digging.
考古學家在發掘之初就知道他們將有重大發現。
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PREP
發現（某人做壞事）；對…覺察；對…知悉
If someone is onto you, they have discovered that you are doing something illegal or wrong.
例句
He did not want Pollard to become suspicious that he was now onto him...
他不想讓波拉德懷疑他已察覺到其不軌行為。
I had told people what he had been doing, so now the police were onto him.
我已將他的所作所為告訴了別人，因此現在警方正在追查他。