上空的用法和样例：
例句
-
这场火把城市上空映得一片通红。
The fire cast a ruddy glow over the city. -
那只外星来的宇宙飞船在公园上空盘旋了一会儿之后就不见了。
After the alien spacecraft had hovered over the park for a short time, it vanished. -
飞机在浓雾上空飞行。
The aircraft was flying above thick fog. -
市镇上空笼罩着一层烟幕。
A pall of smoke hung over the town. -
飞机在着陆之前在机场上空盘旋。
The plane circled the airport before landing.
