努力学习
study hard
努力工作
work hard
努力生产
put great effort into production
努力增产
make a great effort to increase production
努力奋斗
struggle hard
努力推广先进经验
make great efforts to spread advanced experience
努力改造世界观
work hard to reshape one's world view
共同努力
make a concerted effort
不断努力
put in consistent effort
再努一把力
put in still greater effort
尽最大的努力
make the greatest possible effort
这方面还要作很大的努力。
Even more effort needs to be put into this area.