If you're travelling by car, ask whether there are parking facilities nearby.

如果你开汽车旅行，问问附近是否有停车设施。

《柯林斯英汉双解大词典》

If you are in any doubt as to whether you should be doing these exercises, consult your doctor.

如果你拿不准是否应进行这种锻炼，咨询一下医生好了。

《牛津词典》

They were asked to predict whether they'd enjoy the commute more if they conversed with other people.

他们被要求预测如果与他人交谈，他们是否会更享受通勤。

youdao

I also wonder whether if it's a good way of focusing the world's attention on the issue of blood diamonds and on this very important trial by getting such a high-profile figure involved with it."

VOA: standard.2010.08.05

OK, clearly we'd be much better off if we had some systematic quantitative way to tell whether something would happen spontaneously.

好，如果我们有一些系统定量的方法来判断,一个过程是否会自发进行,那就会更好了。

麻省理工公开课 - 热力学与动力学课程节选

But in our collective cultural consciousness, if there is a such thing, whether we like him or not we tend to think of John Milton as powerful.

如果说我们有一种集体文化意识的话，在这个意识里，不管我们喜不喜欢米尔顿，我们都会认为他是强大的。

耶鲁公开课 - 弥尔顿课程节选

For I do wonder whether, if it were possible under US listing laws, whether they would bother to raise new money at all and simply seek an introduction?

FORBES: Facebook's Introduction to Rather Than Flotation on the Stock Market

The question now is whether, if public spending on construction falls, the private sector will pick up the slack.

ECONOMIST: Building firms are struggling to emerge from the recession

There often is debate about whether, if we went the national consumption tax route, a value-added tax (VAT) or retail sales tax (RST) would be better.

FORBES: Critiques of Herman Cain's 9-9-9 tax plan