

夏休みに、友達と森を探検するつもりです。
子どものころ、よく裏山を探検しました。
この島を探検してみませんか。
"たんけんする(探検する)" is in the lesson "Adventures" (Level 36), along with 15 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.