

水族館でイルカのショーを見ました。
海でイルカを見たことがありますか。
イルカはとても頭がいいです。
"イルカ" is in the lesson "Fishes" (Level 14), along with 10 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.