投笔从戎（投筆從戎）　

◎ 投笔从戎 tóubǐ-cóngróng

[throw aside the writing brush and join the army;renounce the pen for the sword;give up civilion pursuits for a military career] 中国后汉班超家境穷困,在官府做抄写工作,曾经掷笔长叹说,大丈夫应当在边疆为国立功,哪能老在笔砚之间讨生活呢!后人把文人从军叫做投笔从戎