work k hard at努力做;高兴做;尽力做
work especially hard at sth拼命做某事
Work Hard At Lessons努力学功课
work hard at math在数学上努力
work hard at sth在某一方面努力工作;努力做某事
Work Hard At Studies刻苦攻读
Work hard at refueling努力学
work hard at school在学校努力学习
work hard at English努力学习英语