The study of mental processes requires both experimental and comparative methods.

当事人应置身于利害之外，提出倡议的人则应设身于利害之中，才能知道利害得失。

Energy security is a crucial part of national strategic security, and we must firmly keep it in our own hands.

欲望使人即使到了天堂也会坐立不安。

一个奇怪的事实是，关于地球史前条件得出了完全相反的结论，这反映了我们目前知识的不完整状态。