It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of Light, it was the season of Darkness, it was the spring of hope, it was the winter of despair, we had everything before us, we had nothing before us, we were all going direct to Heaven, we were all doing direct the other way.
相信你能行，你已经成功了一半。
数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。
A building must be a vessel for life.