要知产药川源处，只在西南是本乡。
要知道产生药物的根源之处，只在西南方向是根本所在。
我们生来都是疯子，有些人一直如此。
The past beats inside me like a second heart.
If you wish to succeed, you should use perdistence as your good friend, experiece as your reference, prudence as your brother and hope as your sentry.
预见数学未来的真正方法是研究它的历史和现状。