Sustainability is not just a trend, it's a responsibility we owe to future generations.

The historian's first duty is to tell the truth as he sees it, regardless of whom it pleases or displeases.

教学的艺术在很大程度上在于唤醒年轻心灵的自然好奇心，并用知识的营养来满足它。

我喜欢讲述那些有点偏离中心、有点奇怪的故事。

这就是学习。你突然以一种新的方式理解了你一生都在理解的东西。