理所当然的的英文：
matter of course

参考例句：

Take .. for granted; underestimate
把..视为理所当然

Take ...for granted
认为...理所当然

Take someone for granted; take someone as a matter of course
理所当然之事

Don't take him for granted.
别当他为理所当然。

It is taken for granted that everyone is equal before the law.
法律面前人人平等是被认为理所当然的。

Try not to take anything for granted.
别把任何事都视为理所当然。

It is a matter of course that a deer is not a horse.
鹿不是马，这是理所当然的。

I don't grudge him his success,ie I admit he deserves it.
我认为他成功是理所当然的.

Don't take it for granted that I'll always be here.
别认为我在这里是理所当然的。

For my part, I take his objection for granted.
就我而言，我认为他的反对是理所当然的。

matter是什么意思：
n. 物质，事情，素材
v. 有关系

be of importance;matter
有重要性;有关系

It is no laughing matter.
这没有什么可笑的。

deposited matter
沉积物|沉淀物

It makes no matter.
那无关紧要。

This is a matter of no account.
这是一件无关紧要的事。

course是什么意思：
n. 过程；课程；方针；系列

a bobsleigh course
大雪橇滑道

It is not, of course, exhaustive
当然这是不够详尽的。

In college, English is a required course and psychology is an elective course.
在大学里，英语是必修课而心理学是选修课。

The checks are all good, of course.
当然，这些支票是完全有效的。

Of course, this can be abused.
当然了，这样还是可能会被滥用。