将革命进行到底!

Carry out the revolution to the end!

到底成功了

finally succeeded

他到底来了。

He finally came.

你跟他到底有什么关系？

What exactly is your relationship with him?

你到底在什么时候能准备好呢？

When can you be ready exactly?

这到底是什么意思？

What on earth is the meaning of this?

你到底要什么呀？

What do you want exactly?

你谈谈到底是怎么回事。

Tell me what exactly is going on.

到底有区别

different after all

他到底还是孩子。

He's still a child, after all.