你辛苦了,用英语怎么说?

最自然的表达。

I appreciate that,或者是That means a lot。

比如这样的场景,孩子最近英语成绩有很大的进步,你想跟老师说一句谢谢。

Thank you so much, I appreciate it a lot.

That means so much to me.

You are the best teacher in the world.

I don't know what we'd do without you.

Oh my god, you are the best.

Easy, right?