"努力吧少年" (nǔ lì ba shào nián) is a common phrase in Chinese that can be translated to "keep working hard, young man" in English. It is often used to encourage someone to continue working hard and not give up.

One possible origin of this phrase is from a famous Chinese poem called "努力吧，少年" (Nǔ lì ba, shào nián) by the poet 冯骥才 (Féng Jìcái), which was written in the 1950s. The poem encourages young people to work hard and persevere in the face of challenges.

Here are some example sentences in English and their translations in Chinese:

"Keep working hard, young man. You will succeed if you don't give up." (努力吧少年，如果你不放弃，你会成功的。)

"Don't be discouraged by failure. Keep pushing forward and you will achieve your goals." (不要被失败打败，努力吧少年，你会实现你的目标的。)

"Remember to always work hard and never give up. Keep striving for success, young man." (记住永远努力并且不放弃，努力吧少年，为成功而奋斗。)