prep.大约于
adv.大约,近似
born circa 150 BC
生于约公元前150年
The woman had been pecking at on Underwood typewriter circa 1950.
这位妇女正敲击着一台一九五○年左右出厂的安德伍德牌打字机.
The story tells of a runaway slave girl in Louisiana, circa 1850.
故事大约发生在1850年,讲的是路易斯安那州一个逃跑的年轻女奴。