

紙の上に小さな点を三つ打ってください。
二つの点を直線で結んでみましょう。
顕微鏡で見ると、黒い点がたくさんありますね。
"てん(点)" 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.