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BNC: 18069 COCA: 29584
ulceration
noun [U] medical /ˌʌlsəˈreɪʃ(ə)n/
  1. the process by which ulcers are formed 溃疡形成;溃疡;溃烂
     Synonyms and related words
    Causes, symptoms and the course of illnesses: aetiology, complication, crisis...

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