

分からない言葉は百科事典で調べます。
図書館に新しい百科事典が入りました。
最近は紙の百科事典をあまり使いませんね。
"ひゃっかじてん(百科事典)" is in the lesson "Education" (Level 14), along with 12 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.