once again和again区别

once again:

Once again there's been ferocious bloodletting in the township.

Once again there's been ferocious bloodletting in the township.

镇上再次发生了血腥杀戮事件。

again:
adv. 又，此外；再一次；再说；增加

She lapsed into silence again.

她又陷入了沉默。

Our cat's gone missing again.

我们的猫又走丢了。

You're preaching at me again!

你又在对我说教了！

Are you causing trouble again?

你又在惹麻烦吗？

It's great to see you again.

很高兴再次见到你。