What do they all have in common? The way they portray their content. They also all have a purpose for existing.

这些有什么共同特点呢？呈现信息的方法相同，存在目的相同。

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For example, as an administrator, you could use the space to create a quick backup, or to compress existing data without having to use a secondary file system for the purpose.

例如，作为管理员，您可以使用这个空间来创建快速备份，或对现有的数据进行压缩而无需为达到该目的使用辅助文件系统。

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Creating test cases, especially for existing code, is very helpful in making the purpose of individual features more clear.

创建测试案例，尤其是为现有的代码创建测试案例，在使单个功能的目的更明确方面是很有帮助的。

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The opposition Labour Party has agreed the building was not fit for purpose but said getting out of existing leases could bring "hidden costs".

BBC: County Hall, Norwich

Perhaps one of the most frustrating and yet satisfying things about the Joker is that he is a pure anarchist, existing solely for the purpose of throwing things off kilter.

FORBES: Moulded By Pain: 'Injustice: Gods Among Us #4' Review

What we have said is that we feel confident, given the nature and the limitations on the mission, that it can be paid for within existing budget appropriations because there are funds that exist for that purpose.

WHITEHOUSE: Press Briefing