A preposition is a word that tells you when or where something is in relation to something else.

介词是一个告诉你某物何时或何地与其他事物相关的词。

Something is higher in relation to something else.

有些东西比其他东西更高。

We talk about in relation to something, so you're always going to have an object, but most commonly you have a surface.

我们谈论与某物有关的东西，所以你总是会有一个物体， 但最常见的是你有一个表面。

The Latin phrase per se, means 'in itself' and is used when considering the qualities of something on its own, not in relation to something else.

拉丁语“per se”的意思是“本身”，指某物自身的性质，与其他事物无关。