每一个挑战都是学习和成长的机会。
La literatura es el arte de la palabra, y la palabra es el vehículo del pensamiento.
Science should serve humanity, not the other way around.
You are never too old to set another goal or to dream a new dream.
Today is cruel, tomorrow is crueler, and the day after tomorrow is beautiful, but most people will die tomorrow night.
杀死一个幽灵比杀死一个现实要困难得多。