Sometimes we get sad about things and we don’t like to tell other people that we are sad about them. We like to keep it a secret. Or sometimes, we are sad but we really don’t know why we are sad, so we say we aren’t sad but we really are.
有时我们为某些事感到悲伤，却不愿告诉别人。我们想保守这个秘密。或者有时我们感到悲伤，却真的不知道为什么悲伤，于是我们说我们不悲伤，但实际上我们是悲伤的。
人类心智在出生时并非一张白纸。
在计算学习理论中，挑战不仅仅是学习，而是理解学习是如何可能的。
过去总是紧张的，未来则是完美的。
每个圣人都有过去，每个罪人都有未来。
Coal has been the backbone of industry, and with innovation, it can continue to be.
"The best films are the ones that stay with you long after you've left the theater."
绅士就是从不无心伤害别人感觉的人。