The evening is the time of day when the light is most beautiful, but it’s also the time when it starts to fade.
Every breakthrough in laser technology brings us closer to solving mysteries that have puzzled scientists for decades.
专制制度就像地狱一样，并不容易战胜，但我们可以安慰的是：斗争越艰巨，胜利将越光荣。
The ultimate goal of machine learning is to make computers learn from experience and improve their performance over time.
你付出什么就会得到什么。你投入什么就会从中得到什么。