资料图:软件工程师

Roustabouts routinely work 12-hour shiftsin tough conditions, it said.

调查称，石油钻台工人的工作通常要实行12小时轮班制，而且工作环境及其艰苦。

The top five jobs, which include mathematician, actuary, statistician and computer systems, typically pay more than twice as much as the lowest jobs -- $83,777 compared to $30,735 per year.

排在最佳职业前五位的还包括数学家、保险精算师、统计学家、和电脑系统分析师。这些职业的年薪可达83777美元，是排在末位的几类最差职业年薪（30735美元）的两倍多。