46. An idle youth， a needy age. 少壮不努力，老大徒伤悲。

　　47. An ill workman quarrels with his tools. 不会撑船怪河弯。

　　48. Art is long， life is short. 生有涯而知无涯。

　　49. As a man sows， so shall he reap. 种瓜得瓜，种豆得豆。

　　50. As one door closes， another door opens. 天无绝人之路。