Merriam-Webster's Advanced Learner's English Dictionary
Longman5++
牛津高阶双解第八版双解切换(可隐藏中文)
The American Heritage Dictionary 3th
Oxford Idioms English-Chinese Dictionary
Macmillan British English
Collins COBUILD Advanced Dictionary
Collins COBUILD Advanced English Dictionary Online
The Chambers Thesaurus 5th
Oxford Advanced Learner's Dictionary 4th
Longman Essay Activator
Longman Collocations Dictionary and Thesaurus
A Thesaurus of English Word Roots
OALD10 oxford advanced learner's dictionary 10th
Oxford Advanced Leaner's Dictionary 9th
Oxford Advanced Learner's English-Chinese Dictionary 8th
Longman Dictionary of Contemporary English 6th
Vocabulary.com