The secret source of Longfellow's humor is not joy but sorrow. There is no humor in heaven.
朗費(fèi)羅幽默的秘密源泉并不是歡樂(lè)而是悲傷。天堂里沒(méi)有幽默。
A good mathematician is lazy, but in a constructive way.
壓力是一種特權(quán)，它意味著你有機(jī)會(huì)做一些偉大的事情。