Could you tell me if I should bring the matter up with her, or if it would be better for me to keep quiet?

你能告诉我，我是否应该把这件事告诉她，还是我最好保持沉默？

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Professor Tindle says the study did not confirm whether optimism leads to healthier choices, or if it actually affects a person's physical health.

VOA: special.2009.04.15

And if we do, in fact, hit it with light to get the electrons off, it will go back to the straight up in position, or if it gets knocked hard enough it does that, too.

而且如果我们这么做，事实上，用光轰击它以逐出电子，它就会在原位置沿直线返回，或者如果它被撞击的足够猛烈,也会出现上述现象。

麻省理工公开课 - 化学原理课程节选

or if it's over a long period of time and it's an ongoing situation that you want to get rid of.

或者是一件持续了很久的事，你特别想摆脱它。

I'm afraid of 课堂 - SpeakingMax英语口语达人

Or if it was a mouse, they dragged ye into their hole, oh mammy.

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We're not making any bets on when this might happen or if it ever will.

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Or if it is a thing, you might produce it and sell it on eBay.

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