努力的名词形式用英语是 "effort"，来源于拉丁语 "ex fortis"，意为 "out of strength"。
例句：
He put in a lot of effort to pass the exam. (他花了很多努力通过考试。)
Her efforts to save the company were in vain. (她挽救公司的努力是徒劳的。)
The team's efforts paid off and they won the game. (球队的努力得到了回报，他们赢得了比赛。)