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主要的义务规则是那些要求或禁止某些行为的规则。
Don't watch the clock; do what it does. Keep going.
不要以虚妄的心伤害自己的本心,不要因外在的因素伤害了自身。
The art of leadership is saying no, not saying yes. It is very easy to say yes.
"The best books are the ones that leave you a little bit different than when you started."