The Oxford English Dictionary Online offers users the most complete, up-to-date, and extensive dictionary from Oxford.

Science has been at the center of important scientific discovery since its founding in 1880—with seed money from Thomas Alva Edison.

Web of Science is the world's most trusted, publisher-independent global citation database. Guided by the legacy of Dr.

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中文在线（www.ChineseAll.com）2000年成立于清华大学，是中国网络出版的开创者之一，为国内最领先的正版数字内容传播机构。