Some schools use big data to understand which children may need extra help in class.

一些学校使用大数据来了解哪些孩子在课堂上可能需要额外的帮助。

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It gives you an extra purpose in class.

这让你在课堂上有了额外的目的。

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After all, we've saved the effort of having to define an extra class just for empty lists.

毕竟，我们不必仅仅为了空链表而去定义一个额外的类。

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Bigger regional jets like 70- and 90-seaters have first-class cabins and extra legroom rows, but not the 50-seaters.

WSJ: Regional Jets: Are These Model Airplanes?

The double US Open champion, seeded third, began nervously and lost his opening two service games but his extra class told as he set up an all-Aussie meeting with Mark Woodforde in round two.

BBC: News | Tennis | Injury wrecks Rios challenge

The willingness of middle-class parents to put time and money into extra tuition for their children meant a fair test at age 11 was impossible to design, he said.

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