

ローマ帝国は長い間ヨーロッパを支配していました。
その帝国は戦争に負けて、ばらばらになりました。
なぜその帝国はそんなに早く滅びたのでしょうか。
"ていこく(帝国)" is in the lesson "Middle ages" (Level 30), along with 11 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.