You add or thereabouts after a number or date to indicate that it is approximate.
例句
He told us that her age was forty-eight or thereabouts...他告诉我们她的年龄在48岁上下。By 1997 or thereabouts Athens will have a new airport, plus the best underground railway in Europe.到 1997 年前后，雅典将有一个新机场，还有欧洲最先进的地铁。
英汉词典释义
adv.
(地点、时间、数量等)大约, 上下
I’ll see you at 9 a.m. or thereabouts.我在九点或大约九点时见你。
附近, 左右
He’s moved to Chicago or thereabouts.他已迁往芝加哥或其附近。
英英词典释义
Adverb
1. near that time or date;
"come at noon or thereabouts"
2. near that place;
"he stayed in London or thereabouts for several weeks"