有用是这些老人曾经对自己最好的希望,而无目的是他们最深的恐惧。
"To be useful was the best thing the old men ever hoped for themselves, and to be aimless was their worst fear."
不登上高山,就不知道天是多么高远;不亲临深溪,就不知道地是多么深厚。
There are two ways to write error-free programs; only the third one works.
Don't watch the clock; do what it does. Keep going.
针对不同的情况采取不同的策略,针对不同的问题采取不同的解决方法,具体问题具体分析。