I only have one exam to go.

我只剩一门考试了。

《牛津词典》

You must play a diamond if you have one.

如果你有方块就必须出。

《牛津词典》

If we ever get married we'll have one terrific wedding.

如果我们结婚，我们会举办一场盛大的婚礼。

《柯林斯英汉双解大词典》

"I have kept my mom off of Facebook. She wants one, I said 'No,you can't have one.'

VOA: special.2009.09.14

if we're actually thinking about electron configuration and we look at lithium, sodium and potassium, these all have one valence electron.

让我们来想一想,锂，钠，钾的电子排布，它们都只有一个价电子。

麻省理工公开课 - 化学原理课程节选

It's more of a, exam-based class. So, I actually had my exam yesterday, and I have one more later on.

这门课主要是以考试为主。事实上，我们昨天刚刚考了一次，不久后还要再考一次。

想进布朗的话 - SpeakingMax英语口语达人

However, it does have one enduring claim to fame: it was the setting for The Birds.

BBC: For the birds: Hitchcock��s California

Ms. HUCKABEE: No, we definitely can't, because we do have one of the ones with formaldehyde.

NPR: FEMA Trailer Mom Says Deal Won't Help

To many of the vast majority that don't have one they're an ostentatious waste of cash.

BBC: Why do people still buy personalised number plates?