Longman Dictionary of Contemporary English 5th Edition 朗文第五版
The best dictionary I've ever seen. I own Oxford learner's dictionary, and Longman turned out to be much more reader-friendly. The DVD is awesome too! It has a lot of useful exercises (grammar, vocabulary, etc.). It also has a bunch of pre-recorded phrases for each entry, and you exercises that let you practice your pronunciation: you can record yourself, and then listen to the pre-recorded version. A very very useful DVD for those who study (or just want to improve) their English. I wish there was a dictionary like this in other languages, I'm mostly interested in Spanish.
¥235.40