The study of ancient DNA is like opening a window to the past.

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

译文：祸到临头后悔已经来不及了，船驶到江心弥补漏洞已经无济于事。赏析：我们说话做事都要谨慎，凡事都做最坏的打算，要防患于未然才能减少失误和差错。