The best way to cheer yourself up is to try to cheer somebody else up.
我不喜欢做简单的事,我喜欢接受挑战。
历史是让死者开口说话的艺术。
The interest of the behaviorist in man's doings is more than the interest of the spectator—he wants to control man's reactions as physical scientists want to control and manipulate other natural phenomena.