奋战 (fèn zhàn) — to fight bravely; to strive hard

Definition

Examples

• 战士们在前线奋战。
  Zhàn shì men zài qián xiàn fèn zhàn.
  The soldiers fight bravely on the front line.
• 为了按时完成任务，大家奋战了三天三夜。
  Wèi le àn shí wán chéng rèn wu, dà jiā fèn zhàn le sān tiān sān yè.
  In order to complete the task on time, everyone worked hard for three days and three nights.
• 他奋战在科研第一线。
  Tā fèn zhàn zài kē yán dì yī xiàn.
  He strives hard on the front line of scientific research.