副詞 or so:

1. (of quantities) imprecise but fairly close to correct
   同義詞：approximately, about, close to, just about, some, roughly, more or less, around

1. Grandad usually conks out (ie sleeps) for an hour or so after lunch.
   爺爺吃過午飯往往要睡一個小時左右。
2. The oil wells will all run dry in thirty years or so at the present rate of use.
   按現(xiàn)在的消耗速度，三十年左右現(xiàn)在的油井就會干涸。
3. The county town is a hundred li or so away from here.
   縣城離這有百兒八十里。
4. There are 300 students or so in this middle school.
   這所中學(xué)大約有300個學(xué)生。