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I found several Advanced Learner's Dictionary for ESL learners as following, but I'm not sure which one is the best. Could you guys give some comment. Thanks in advance.

Oxford Advanced Learner's Dictionary, 8th Edition
Longman Dictionary of Contemporary English, 5th Edition
Collins COBUILD Advanced Learner's English Dictionary, 6th Edition
Cambridge Advanced Learner's Dictionary, 3rd Edition
Macmillan English Dictionary for Advanced Learners, 2nd Edition
Merriam Webster's Advanced Learner's English Dictionary, 1st Edition

Hey I was looking forward to watch this. I think all the good. And in my opinion oxford is best,

i'm using top three of this in my mobile.it's cool and i almost use the oxford and collin.But i prefer to speak american english and use it for my work so longman is the cool second choice...

I have used Oxford, Longman and Merriam, and I find that Merriam is the best. Words are defined clearly, with idioms and pronounciation. Highly recommended!