该对象集合可在需要时用来摘取相关信息。
This object collection can be used as needed to extract relevant information.
另一种是历史文献法，即通过收集多种文献资料，摘取与课题研究相关信息的方法。
Another one kind is historical document law, is to pass the data collecting the various document, extracts the method studying relevance information's with the problem.
另一种是历史文献法，即通过收集多种文献资料，摘取与课题研究相关信息的方法。
Another one kind is historical document law, is to pass the data collecting the various document, extracts the method studying relevance information's with the problem.
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