Toyota says its fuel cell car FCHV-adv can travel 515 miles on a full tank of hydrogen, but it may not see mass production until 2016.

丰田公司说他们的燃料电池汽车 FCHV-adv 装满一箱氢气能行驶820千米，但在2016年前可能不会投入量产。

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The doctors will operate if necessary—but it may not come to that.

必要时医生会施行手术，但也许还不致如此。

《牛津词典》

But it may not have to.

可是也未必。

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But it may not be to better effect, says the psychologist.

VOA: special.2009.01.28

and it's going to be light there but it may not be as light as we would like it.

我们也会胜利的,但可能不会是那么圆满。

普林斯顿公开课 - 国际座谈会课程节选

It may not clearly think about things, about objects, but it has a kind of legitimate basis that generates the sort of thinking that it does.

意识可能并不能清晰地思考事物，却有正当的依据,产生出它的思想。

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But it may not be that easy, as companies in similar situations have already discovered.

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The feeling of relief can feel cleansing, but it may not necessarily be improving your health.

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But it may not be true, and somehow nobody, including me, bothered to notice.

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