"原来如此"的英文怎样写?

That's so.

原来如此。

That's why.

原来如此。

That is so!

原来如此！

So that's how it is!

原来如此！

Ah, that accounts for it!

啊，原来如此

That accounts for the milk in the coconut.

EXAMPLE:
啊，原来如此！
Ah, that accounts for it!

no wonder
He's sick. No wonder today he doesn't come to work.

turn out
He doens't come to work today. It turns out that he's sick.

So it is!!!
So that is!!!