现在已经没有必要这么做了。

That will not now be necessary.

youdao

现在承载介质已经没有必要了，内容发布商就没东西可卖了。

Now that the medium is evaporating, publishers have nothing left to sell.

youdao

或者，在几代人后，我们已经没有必要去限制吸烟，因为已经没有人吸烟了。

Or maybe in a few generations, it won't be necessary to regulate smoking: There won't be any smokers left.

youdao

They're already paying for public transport, so it's just kind of a financial expense they could do without.

他们已经向公共交通付钱了，所以，那只是一笔没有必要的财务支出。

公共交通更方便 - SpeakingMax英语口语达人

because you've already done it or you don't need to do something because you've already done it before.

因为你之前已经做过，或者你觉得因为之前做过就没有必要再做了。

I've already 课堂 - SpeakingMax英语口语达人