【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 art of progress is to preserve order amid change and to preserve change amid order.
心灵不是一种事物,而是一个过程。
Laughter is timeless,  imagination has no age, and dreams are forever.
The more time I spent on mathematics, the more excited I got.