The subject nature of library science is a controversial proposition. There are five representative viewpoints at present.

图书馆学学科性质是有争议的命题，目前具有代表性的观点有五种。

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The findings, reported in papers published by Nature and the Public Library of Science, were based on samples from 242 healthy volunteers in the U.S., from such sites as the mouth, nose, skin, intestine and vagina.

WSJ: Gene Map of Body's Microbes Is New Health Tool