You got 7 out of 100 10. Exactly, is your score 7 or 3 (full mark 10)?

It means: the highest score is ten, and you got seven. Another example is:

Out of 400 points, I got 387 points.

400 points out of 387 points.

Ranked 7th in 10 library.

Ranked seventh in the 10 library.

As for out, you don't have to choose words. There is no absolute one-to-one translation in English. Reciting a single word is not as good as reciting specific sentences in groups (note that I am talking about sentences, non-verb phrases, etc. ). For example: finish school with good credit: graduate with excellent results; Choose to draw lots: draw lots; Pay extra: spend money; Infinity: everything. Wait, in fact, if you pay attention, every lesson you learn will have several similar expressions. Remember more, when you see Chinese when you need it, the corresponding English will be in your mind, instead of changing Chinese into English one by one. ...