I recommend Longman New Chinese Dictionary (Third Edition). Its features are as follows: 1. Cangjie code 9 sample quotations 2. T9 code (T9 difficult character list is also provided) 10 synonyms and antonyms 3 indicating stroke order 11 word collocation 4 four phonetic phonetics 12 word analysis 5 indicating part of speech 13 famous sayings and aphorisms 6 literary knowledge 14 Cultural Topics 7 Chinese Language Knowledge 8 Proverbs and Idioms Comes with a CD, providing: 1. Full text of the dictionary 2. Four checking methods 3. Cantonese pronunciation of more than 600 difficult words 4. Hyperlinks to all "mutual" parts 5. "Bookmarks", Additional functions such as "Notes" include eclectic Cantonese pronunciation and are not limited to classical books. It contains 8,000 characters and 25,000 words. This dictionary was ordered in my middle school. I think this dictionary can look up many words, and it is very good.

Reference: Longman New Chinese Dictionary (Third Edition)

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I recommend you to use the Business Chinese Dictionary^.^