OXFORD UNIVERSITY：University of Oxford

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oxford learner’s dictionary The world's bestselling dictionary for learners of English with over 60,000 words, 1000+ new words, and online resources. Learn vocabulary with the Oxford 3000, 5000, and OPAL word lists, and improve your speaking and writing skills with the Oxford Speaking Tutor and Writing Tutor

oxford collocation Learn how to use collocations with exercises, reference pages and special pages on various topics. The dictionary also explains what collocation is and how to understand its entries