Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Excellent Dictionary for Students or Scholar

For every German student, a friend in need is this ditionary indeed. Simple definition and easy cross reference are very helpful for begginers, and various idioms and multiple entries are for experts. But you may refer the dictionary only at home, because it is too heavy to tote (about 2kg! ). So if you have to bring it daily to your classroom or office, perhaps you need another smoller one, with this excellent dictionary at your home.