It is used when there are no indexes on one or more joining tables, or when the database server must read a large number of rows from all joining tables.
当一个或多个连接表上没有索引时，或者当数据库服务器必须从所有连接表中读取大量行时，就使用这种方法。
It is more like a digital news-stand than a personalised magazine: users can subscribe to various publications, but must read each one separately instead of seeing all their stories together.
它看起来更像是一个数字杂志摊而并非个性化定制的杂志，读者可以向不同的出版商订阅电子杂志，但每次只能读到其中一篇文章而不是读照单全读。
It takes just seconds to read an E-mail or a politician's tweet. One must make some heroic assumptions about the appeal of digital media to think they influence people as much as traditional outlets.
要想认为数字媒体同传统媒体拥有同等的影响力，他不得不就其吸引力做出巨大的假设。
To do these three things it must read your program top to bottom in one pass, looking for your SQL delimiters.
为了完成这三件事，它会将程序从头到尾读一遍，查找SQL分隔符。
To learn a language, one must read literary works. But, it does not mean to learn the speech.
学语言必须读文学，但读文学不等于学文学而是学语言。
There's a letter for you, Mrs Linton, 'I said, gently inserting it in one hand that rested on her knee.' you must read it immediately, because it wants an answer.
“有你一封信，林惇夫人，”我说，轻轻把信塞进她摆在膝上的一只手里。“你得马上看它，因为等着回信呢。”
There's a letter for you, Mrs Linton, 'I said, gently inserting it in one hand that rested on her knee.' you must read it immediately, because it wants an answer.
“有你一封信，林惇夫人，”我说，轻轻把信塞进她摆在膝上的一只手里。“你得马上看它，因为等着回信呢。”
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