How the word "くぶん（区分）" is translated into English
軍には陸軍、海軍、空軍という区分があります。
この書類はどの区分に入りますか。
年齢による区分は必要ないと思います。
"くぶん（区分）" is in the lesson "Military" (Level 31), along with 13 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.
