There are hundreds and hundreds. English is particularly rich in idiomatic expressions.

习语有成千上万。英语习语表达方面特别丰富。

I'll look up the rate. To look up doesn't mean to look high into the sky or to look at the roof. It means to search for and find some information.

“I'll look up the rate.” To look up的意思不是抬头看天空或屋顶。它是指搜寻或找一些信息。

That is just a natural, grammatical English expression. It has a direct translation in other languages.

这仅仅是一个自然的、语法上的英文表达。它可以直接翻译成其它语言。