If, by contrast, everything was in a pile on the main floor, it would significantly reduce the usefulness of the library by making the search for materials virtually impossible.
如果采用相反的方式，将所有的东西都堆在一个大房间里，由于几乎不能进行资料搜索，因此会大幅度降低图书馆的有用性。
Even if these findings lead to the development of an earthquake warning system, Ian Main, a seismologist at the University of Edinburgh, UK, warns that its usefulness will be limited.
英国爱丁堡大学的地震学家伊恩·麦恩(IanMain)提醒道，即使地震预警系统因这些发现而得以建立起来，其实用性仍是有限的。
The test developers 'main task is to find an optimal balance among them so as to guarantee the usefulness of language tests.
作为试题的设计者，其主要任务就是要寻找这六个方面的最佳平衡点，保证其编写的试题项目起到预期的作用。
The test developers 'main task is to find an optimal balance among them so as to guarantee the usefulness of language tests.
作为试题的设计者，其主要任务就是要寻找这六个方面的最佳平衡点，保证其编写的试题项目起到预期的作用。
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