Using English-English Dictionaries

This week on the another English course I learned a new skill “Using English-English Dictionaries”- Why and How, teacher taught why was it used English-English dictionary to us, he explained several words translated error in the English-Chinese dictionary, because publishing house mostly want to reduce the cost, so he give us another way to help us more completely understood how to use the word, That was to choose the English-English dictionary, se said the English-English dictionary relatively there will be the word of the integrity introduction and usage, We can get the better concept from it.