有道词典

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权威的英英词典，会详细给出...

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Pioneers in Language Reference for 200 years. Popular and trusted online dictionary with over 1 million words. Find definitions, meanings, synonyms, pronunciations, translations, origin and examples.

Longman English Dictionary - the leading dictionary for learners of English of all levels: definitions, idioms, examples and more.

The largest dictionary of idioms and phrases currently in use in British, American and Australian English. Over 12,000 phrases and expressions.