机器学习的最终目标是让计算机从经验中学习，并随着时间的推移提高其性能。
The ultimate goal of machine learning is to make computers learn from experience and improve their performance over time.
When we speak of 'meaning' a word， we are in the first instance speaking of a certain kind of act.
Take long walks in stormy weather or through deep snows in the fields and woods, if you would keep your spirits up. Deal with brute nature. Be cold and hungry and weary.
只有在以某种有价值的东西做目的时，性命才有价值。
"The past is never dead; it’s not even past."