爱不是容易的事。
People are always blaming their circumstances for what they are. I don't believe in circumstances. The people who get on in this world are the people who get up and look for the circumstances they want, and, if they can't find them, make them.
我们数量增长到如此地步，以至于我们的存在像疾病一样明显削弱了地球。
The ultimate goal of machine learning is to make computers learn from experience and improve their performance over time.