観客audience観光sightseeing観察observation観測observation観念idea観look観衆spectators観点point of view観覧viewing外観appearance客観objective主観subjectivity悲観pessimism楽観optimism
光 こう
観光sightseeing光景scene日光sunlight蛍光灯fluorescent lamp光線beam光沢brilliance光熱費cost of fuel and light