名胜: a place famous for its scenery or historical relics, scenic spot...
变化: change, variation, to change, to vary...
年级: grade, year (in school, college etc)...
沙子: sand, grit...
宽阔: expansive, wide, width, thickness...
侦察: to investigate a crime, to scout, to reconnoiter, reconnaissance, detection, a scout...
