002方向对比速度快重要

“So often, people are working hard at the wrong thing. Working on the right thing is probably more important than working hard.”－－Caterina Fake, co-founder of Flickr

work hard  勤奋努力
work on a math problem 做数学题
work on schoolwork/a project 做作业
work out a solution/proposal   解决得到了办法／方案