The world must engage with us, if not today, then tomorrow.

这个世界不得不与我们打交道，如果不是在今天，那就是拖到明天。

youdao

Is it possible to change things, if not today then over the long term?

改变事情是可能的，如果不是今天，也可以作为长远考虑。

youdao

Would the U.S. be radically different today if Kennedy had not been assassinated?

如果肯尼迪没有被刺杀，今天的美国会大不相同吗？

《柯林斯英汉双解大词典》

It would not be remembered today if it were not for Faulkner's later work.

VOA: special.2010.01.03

So realize if it doesn't quite sink in today, not a problems in terms of these low level details.

如果你们没有完全吸收我今天讲的内容，没关系,这些小细节都会在习题集中找得到。

哈佛公开课 - 计算机科学课程节选

Now we can do more than that if we're being nerdy, but I'm not going to be this nerdy today.

如果我们再深究还能获得更多信息,不过今天就算了吧

耶鲁公开课 - 博弈论课程节选

Cutting government spending, deficits and debt promotes economic growth because such runaway government obligations imply to the markets runaway tax increases in the future, if not today.

FORBES: Presidential Debt-Limit Deceptions And Economic Growth

She posits that every individual in the United States will require health care at some point in their lifetime, if not today, perhaps even next week or next year...

WSJ: Highlights From the Ruling

If not today, then in 12-18 months.

FORBES: At CES, the only Law that Matters is Moore's Law