The economist must be greedy of facts; but facts by themselves teach nothing.
经济学家必须贪婪地收集事实；但事实本身并不能说明什么。
Life is composed of lights and shadows,and we would be untruthful,insincere,and saccharine if we tried to pretend there were no shadows.
解析：不要窃取他人的成果，不要忘记自己的耻辱。
我对这场战争了解的不多，但我知道美国的很多年轻人都参与了这场战争。