12 费劲 [費勁] fèijìn (cost-energy) strenuous, need or exert great effort: 他看中文书一点儿不~. He can read Chinese books without any difficulty. || 学习~ exert great offort in studying || 求你做点儿事这么~, 算了, 不求你了. It is so hard to get your help. Forget it, I won’t ask you again. '