It can be black, white or grey.

它可能是黑的、白的或灰的。

《牛津词典》

It could be a virus, or it could be all in the mind.

这可能是种病毒，或者可能全是凭空想像。

《柯林斯英汉双解大词典》

Don't be too long about it or you'll find someone has beaten you to it.

别耽搁太久，否则你会发现已经有人抢在你前面了。

《柯林斯英汉双解大词典》

Or,it can be severe. The National Headache Foundation says more than forty-five million people in the United States suffer chronic headaches.

VOA: special.2011.05.03

+4 Because this could be three plus four, 3 times five, or it could be three, plus four times five.

因为这可能是，然后乘以5，也可能是，加上4乘以5。

麻省理工公开课 - 计算机科学及编程导论课程节选

that it could be blown out of proportion and misused by the principal or by third parties.

那么事态可能会扩大，安乐死的做法会被主要相关人员和第三方滥用。

对于安乐死的看法 - SpeakingMax英语口语达人

This path would not be (politically) easy for the U.S., and it may or may not even be possible for Greece.

FORBES: Our Big, Fat Greek Bankrupcty

In some cases, the lawyer can negotiate a carve-out of certain information that is valuable to the employee (e.g. performance evaluations) so it can be used in future employment or business.

FORBES: The Top Ten Reasons to Hire a Lawyer to Review Your Severance Agreement

The extent of casualties was not immediately known, and one U.S. official said it could be a day or two until the full extent of damage is known.

CNN: Taliban say Omar safe, deny strike hit leadership compound