consume for nothing;expend in vain;waste;consume ;
But can be expected, when the document database contains a very large amount of information, the time and space must also be at quite large costs for doing text pretreatment, Chinese word segmentation and making indexed database.
但是可以预想,当文档库所包含的信息量非常大,对文档全部内容进行预处理,再分词建立索引库,时空耗费必然也相当庞大。
There are extraneous occupations eat away precious time.
有些无关紧要的工作,不过是空耗宝贵的时间.
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