

太陽のエネルギーを使って電気を作ります。
この機械はあまりエネルギーを使いません。
どうすればエネルギーを節約できますか。
"エネルギー" is in the lesson "Engineer" (Level 39), 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.