信件是传记作者的金矿;它们揭示了官方记录所隐藏的东西。
Letters are the biographer's gold mine; they reveal what official records conceal.
科学是使复杂变得可理解的艺术。
教师不应该像往空容器里倒知识那样教学,而应该像点燃火焰那样教学。
Quality is not a concept; it is a reality.