艰苦奋斗 [- - fèn dòu]work hard and perseveringly; struggle hard amid difficulties; work diligently in defiance [in spite] of difficulties; wage an arduous struggle; persistent hard work; hard struggle:
•¶艰苦奋斗、 勤俭建国的方针 policy of plain living and hard struggle, of building up the country with industry and thrift