从历时、共时两个角度进行比较分析，发现其存在的意义。
From lasted for a total of two points of view, we will found the meaning of its existence.
在这个电子下载盛行的年代，书店和图书馆就能够保持其存在的意义吗？
Can the bookstores and libraries of this world stay viable and relevant in this age of e-downloads?
我们希望保留表4，在结果部分新加入的一段话帮助解释了其存在的意义。
We prefer to retain the use of Table 4 for reasons that it should be clear from the new paragraph inserted at the end of the Results section.
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