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.

知识越少越准确，知识越多，疑惑也就越多。

Truth in drama is always elusive, but that doesn't mean we shouldn't chase it.

In computer science, we often deal with problems that are easy to state but hard to solve.