This series is meant to strongly support your acquisition of vocabulary, the biggest key of all to increasing your Japanese language abilities. This volume is the fourth in the series, corresponding to the N1 level. It creates relationships between vocabulary terms in size-based divisions to allow for efficient memorization. In addition to example sentences, phrases and related terms are introduced when appropriate to further deepen your understanding. English, Chinese, and Korean translations are provided, and a handy red sheet is included.