Make good use of mathematics, physics, and chemistry, and you won't be afraid of time travel. Learn history, politics, and geography well, and you won't be afraid of troubled times. Life is like a play, a killer in love, a hero on the battlefield to defend the country; a play is like life, a financial giant, the commander of the five armies defeats the real dragon; a long journey, a period of growth, where should we go in the end?
