我们可以猜一猜这封信的作者是谁。

We can guess the writer of the letter.

youdao

我刚刚收到这封信。甚至不知道是谁写的。

I've only just received it. I don't even know who it's from.

youdao

查出是谁写这封信的并没费什么劲儿。

It wasn't hard to ferret out who wrote the letter.

youdao

那个家伙是谁写的这封信发电子邮件给我。

The guy who wrote the letter emailed me.

youdao

那个家伙是谁写的这封信发电子邮件给我。

The guy who wrote the letter emailed me.

youdao