2017考博英语作文23类热点话题例句：交通事故
新东方在线考博频道整理了23类考博英语作文热点话题例句，希望考博生们背诵下来运用到考博英语作文中，提高考博英语作文分数。
Traffic accidents have long been a problem and are becoming a severe problem
原因：
1、many drivers are forced to drive days and nights
2、a lot of people drive after drinking alcohol