【讲解】：发奋时候竟忘记吃饭，快乐时候就忘记了忧愁，把自己就要老了这件事也不放在心上，如此罢了。”
The only limit to our realization of tomorrow is our doubts of today.
We must keep learning to keep up with the times.
Language is the only homeland.
The best way to predict the future is to create it yourself.
你必须在别人不努力的时候努力，这样你才能在别人不发光的时候发光。