The death of a beautiful woman is, unquestionably, the most poetical topic in the world.

"Life, he realize, was much like a song. In the beginning there is mystery, in the end there is confirmation, but it's in the middle where all the emotion resides to make the whole thing worthwhile."

数学是一种创造性的努力，就像艺术或音乐一样。

Never give up. Today is hard, tomorrow will be worse, but the day after tomorrow will be sunshine.

煤炭的未来在于清洁高效利用。