艰苦努力，艰苦奋斗，努力工作

1. strenuous effort, hard struggle, working hard

noun (common) (futsuumeishi) intransitive verb noun or participle which takes the aux. verb suru

激战，鏖战

2. hard fighting, fierce fighting

noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verb