The worth of a psychological theory is measured by its usefulness.
不肖:品行不好,不正派。观察他所交往的是些什么人,就能看出他是品德好的人还是不正派的人。
Economic history teaches us that change is possible, but it is rarely easy.
在竞争激烈的市场中,创新是唯一的取胜之道。
The photograph is the most perfect picture.