You have four source attributes mapped to one target attribute.

您将四个源属性映射到了一个目标属性。

youdao

But if you have four users connected, when should you exit?

但是对于连接了四个用户的程序，应该何时退出呢？

youdao

Why do you have four different chapters of this book, all telling the same story?

为什么一本书要有四个不同的章节，来讲述同一个故事？

youdao

When you only have one classroom, but you have four different classes, you can only separate them by benches.

VOA: standard.2010.02.25

Let's say you have four questions, you have 50 minutes, take out five minutes to read the paper, so that's 45 minutes.

你有四个问题，你有50分钟，花5分钟阅读考试，剩下45分钟。

麻省理工公开课 - 固态化学导论课程节选

You have four chances to move 10 yards,

你有四次机会去推进十码，

美式足球 - SpeakingMax英语口语达人

So if you have four babies in tow, you have to pay for one.

WSJ: Little Ones, the Subway and the Law

Even when you look at cellular phones in the second generation you have four different standards: GSM, TDMA, CDMA, PDC.

CNN: Business: Inside the Semiconductor Boom

Granted, if you have four kids, such as myself, you can get away somewhat with handing down equipment to the younger children.

FORBES: Sporting Goods Stores Profit From Our Breeding