Because of their simplicity, key-value stores are useful for a smaller set of jobs but can do those jobs very quickly.
由于其简单，键值存储对于较小系列的作业非常有用，而且可以非常快速地执行那些作业。
This update is designed to reduce rankings for low-quality sites - sites which are low-value add for users, copy content from other websites or sites that are just not very useful.
这次更新的目的是降低劣质网站的排名，包括对用户价值低的、从其他网站拷贝内容的网站或不太有用的网站。
In fact, the process of providing a context in the first place can be a very useful exercise in terms of identifying the value of a particular practice or set of practices.
实际上，首先提供上下文是一种非常有用的练习，对识别某个或某组特定实践的价值非常有帮助。
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