The biographer's challenge is to be both a detective and a poet.
传记作者的挑战在于既要成为侦探，又要成为诗人。
The theory of probabilities is at bottom nothing but common sense reduced to calculus.
There is no man, however wise, who has not at some period of his youth said things, or lived in a way the consciousness of which is so unpleasant to him in later life that he would gladly, if he could, expunge it from his memory.
外交不仅是国家之间的事务，也涉及到全球问题和全人类的利益。