Time flies.时光易逝。
One today is worth two tomorrows. 一个今天胜似两个明天。
When an opportunity is neglected, it never comes back to you. 机不可失，时不再来。
Strike while the iron is hot. 趁热打铁。
Wisdom is more to be envied than riches. 知识可羡，胜于财富。
It is good to learn at another man's cost. 前车可鉴。
Seeing is believing. 百闻不如一见。