wikipedia维基百科 Dictionary
wikipedia维基百科镜像站，方便国内访问 The World's most comprehensive free online dictionary, thesaurus, and encyclopedia with synonyms, definitions, idioms, abbreviations, and medical, financial, legal specialized dictionaries
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朗文英文词典 Longman Dictionary of Contemporary English
Longman English Dictionary - the leading dictionary for learners of English of all levels: definitions, idioms, examples and more. Longman English Dictionary - the leading dictionary for learners of English of all levels: definitions, idioms, examples and more.
Abbreviations 缩略语 Abbreviations.com
数十万条目的缩略词 The Web's largest and most authoritative acronyms and abbreviations resource.