about
prep.
關于, 對于
在...附 近, 在...身邊; 手頭上, 近于...
在...前后, 在...周圍
在...各處, 去...各處
短語:be about to (do) 剛要,即將
聯想記憶
approximately adv. 約,近似地
roughly adv. 粗暴地;粗魯地;粗略地;約略地
辨析
about 作“大約”講,可與approximately換用,但前者不如后者那樣強調對精確度的接近。
approximately 作“近于,接近”講,表示精確程度非常接近某儀標準,其誤差極小甚至可以忽略不計。
roughly 意為“粗略,大約”,經常用來代替approximately或about。該詞常含有隨便、草率的意味。
例句
Tell me what has happened as it is; don't beat about the bush.
如實告訴我究竟怎么了,不要兜圈子。
Per square kilometer approximately has 200 residents.
每平方公里大約有200居民。
There were roughly 500 people.
大約有500人。