

公共の場所ではタバコを吸わないでください。
駅の近くに公共のトイレはありますか。
この町は公共交通機関がとても便利です。
"こうきょう(公共)" is in the lesson "Ask for help" (Level 41), 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.