If you would like to start trampolining, you may first need to ask a doctor to make sure it's a safe activity for you.

如果你想开始玩蹦床，你可能首先需要请医生确保这对你是一项安全的活动。

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Some girls may first ovulate even before they menstruate.

有些女孩初次排卵可能甚至早于她们的月经。

《柯林斯英汉双解大词典》

Scientists say that humans may first "talk" with mammals and then other vertebrates such as fish.

科学家说，人类可能会先与哺乳动物“交谈”，然后是其他脊椎动物，比如鱼。

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On May first, he made a campaign speech to a big crowd at Mount Vernon,Ohio.

VOA: special.2009.10.22

Some scholars have even speculated that Christians may have been the first to do this, because they were arguing with their friends,the Jews.

有些学者甚至推测,基督教徒是首先这样做的，因为他们在和犹太朋友争辩时。

耶鲁公开课 - 新约课程节选

And it may well be that no poem has ever been since Paradise Lost published with line numbers in its very first edition.

只有《失乐园》首次印刷的时候把行数印上,之后的诗歌都没被这么出版过。

耶鲁公开课 - 弥尔顿课程节选

In the long run you would come out ahead but you may first need very deep pockets.

FORBES: Scientists Beat The House At Roulette With Chaos Theory

The taxes may first be pitched to discourage the bad behavior, but the taxes are a revenue source.

FORBES: Will E-cigarettes Become A Taxing Experience ?

For schizoid personality disorder to be diagnosed, doctors may first need to rule out conditions with similar symptoms, such as autism or Asperger's syndrome.

CNN: Schizoid personality disorder