So there's obviously some challenges, for if this proposal is easy, it has already been done.

当然，这其中也有很多困难，因为要是这个计划很简单的话，早就已经被实现了。

youdao

But he warns it will be difficult to undue all the economic damage that has already been done.

但是他同时警告说，要想解决所有已经存在的经济问题还是很困难。

youdao

In this case, a trigger can be implemented to first verify that the validation has already been done.

对于这种情况，可以将触发器实现为先确定是否执行了验证。

youdao

Much work has already been done.

VOA: special.2009.10.06

One is the processing has already been done so the introns are already out, so you don't have to figure out what's exon and what's the intron, it's already done for you.

一是DNA已经过处理,内含子已经没有了,你不用分辨哪些是外显子哪些是内含子,这些都已经帮你做好了

耶鲁公开课 - 生物医学工程探索课程节选

They claim they do not want to politicize the face veil, but most French agree this has already been done.

VOA: standard.2010.01.30

But for now, what has already been done has not baked inflation into the cake.

FORBES: America, Be Thankful: Bernanke Critics' Prophecies Of Inflation Have Been Dead Wrong

Some of this stuff is -- builds off of what has already been done.

WHITEHOUSE: Press Briefing

Mr Berlusconi will find that some of the groundwork has already been done for him.

ECONOMIST: A survey of Italy