In most cases, we just don't know how many Britons contract diseases when abroad.

在大多数情况下，我们只是不知道有多少英国人在国外感染了疾病。

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Some do not know how to look for a house for rent or how to read and negotiate a rental contract.

有些人不知道如何寻找出租的房屋，也不知道如何阅读和磋商租住合同。

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Contract programming means that one class provides a contract to another — in other words: "Here is what I will do, and you don't need to know how it's done."

契约编程意味着一个类向另一个类提供一张契约——换言之：“这是我要做的工作，你不需要知道它是怎样完成的”。

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"Capita promised to save the Army hundreds of thousands of pounds in recruitment costs when they won the contract and we now know how they intend to do it - through closing recruitment centres that for decades have been valued features of British high streets, " Mr Smith said.

BBC: Army careers offices: Seven of 12 close in Wales