

地球から月までの距離はどのくらいですか。
二つの点の距離を定規で測りました。
光は一秒でとても長い距離を進みます。
"きょり(距離)" is in the lesson "Science" (Level 39), 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.