You must play a diamond if you have one.

如果你有方块就必须出。

《牛津词典》

"Man! You have one big nose!" I felt hurt and didn't know what to say.

“哇！你有一个大鼻子！”我感到很受伤，不知道说什么好。

youdao

Those who want to ban the bomb for American citizens claim that if you have one locked in the cabinet, with the fuse in a drawer, you would never be able to assemble it in time to stop an intruder.

那些希望禁止美国公民使用这种炸弹的人声称，如果你把一枚炸弹锁在柜子里，把导火线放在抽屉里，你就永远无法及时组装起来，阻止入侵者。

youdao

"We went to the hazmat safety classes, and you have one guy telling you you don't want to be in it.

VOA: standard.2010.05.06

You have one rule invoking another rule and then you can get a sentence like "Fred thinks Barney likes Wilma."

遵循调用前一个规则的这个规则,这样你就得到了,像"弗雷德觉得巴尼喜欢威尔玛",这样的句子

耶鲁公开课 - 心理学导论课程节选

And it will be a topic that you can discuss with your exchange partner if you have one.

如果你有语伴的话，这将是你们可以讨论的一个话题。

学外语的时候 - SpeakingMax英语口语达人

When you have one party that has lots of stations, it can try niches or more experimental programming.

FORBES: Free the Airwaves

Cardiac rehabilitation isn't appropriate for everyone, though, even if you have one of these conditions.

CNN: updated

Check your local newspaper (if you have one) or, better yet, realclearmarkets.com and see.

FORBES: Twenty Reasons to Be Optimistic