When one search documents by keyword, Usually find a great deal of relevant literature which makes people difficult to gain literature they want fast and accurately.
特别是当人们输入一个关键词查找文献时，通常会查找出大量的相关文献使人们很难快速而准确的获得想要的文献。
But things don't always work the way we want, and they seldom happen as fast as we'd like.
然而，事情并不总是按我们希望的方式运行，也很少像我们想要的那样很快成功。
They want their computers to always run as fast as when they first bought them.
他们想让计算机永远跑得像刚买来时那么快。
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