没有人知道是谁实施的这次袭击。

It's not known who carried out the attack.

youdao

最主要的是，我们现在已经知道了是谁实施了这次袭击，怎样实施这次袭击。

The main thing is that we know who committed this attack and how.

youdao

我们仍然在搜集有关谁应当对此事负责的情报，但是还没有迹象表明究竟是谁实施了绑架行动。

And we are still gathering information about who might be responsible but we don't have an indication of who did it.

youdao

Now, how in the world can somebody actually make that work for a whole country?

全世界有谁能使这种体系,在全国范围内有效实施？

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