His contribution could be key.

他的贡献可能是最重要的。

《牛津词典》

The consequences could be serious.

后果可能是严重的。

《牛津词典》

Oh well, it could be worse.

哎，算了，情况本可能会更糟的。

《柯林斯英汉双解大词典》

In many areas of fast-flowing water, a boat could be turned over by a wave as high as a house.

VOA: special.2009.10.07

- "She lived unknown and few could know"-- how can she be unknown if few know anything about her?

她不为人知地活着，鲜有人知道她“,如果有任何人知道关于她的任何事情,又怎么能说他不为人知呢？

耶鲁公开课 - 文学理论导论课程节选

It could be information-oriented, it could be a dialogue, it could be some kind of tools, a request function or dictionary or computing request.

可以是信息导向的，也可以是对话，或者是一种工具，一种对功能的需求，比如对字典，计算的需求。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

Now the 6-foot-1 Franklin isn't a could-be from Colorado with the size 13 feet, a future star on the rise.

WSJ: 2012 London Olympics: A Priceless Gold for Missy Franklin - Jason Gay

America Online suggested that your primary account -could- be your real name, but if you did that, it was recommended you create a second account with a screen name by which you interacted with other users on the service.

FORBES: Enders Game, Orson Scott Card, and People who Hide Behind Pen Names

Willing strangers--could be a 12-year-old, could be an expert, you'll never know--click on the questions and provide answers for free.

FORBES