

てんのうせいは横に倒れたまま回っているそうです。
てんのうせいは肉眼ではほとんど見えません。
てんのうせいを発見したのは誰か知っていますか。
"てんのうせい(天王星)" is in the lesson "Space" (Level 25), 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.