I like dogs. You always know what a dog is thinking. It has four moods. Happy, sad, cross and concentrating. Also, dogs are faithful and they do not tell lies because they cannot talk.
我喜欢狗。你总能知道狗在想什么。它们只有四种情绪：快乐、悲伤、生气和专注。而且狗很忠诚，它们不会说谎，因为它们不会说话。
为了克服当代生活的焦虑和抑郁，个人必须在一定程度上独立于社会环境，不再仅仅根据其奖励和惩罚来做出反应。
工具变量的美妙之处在于它们让我们以新的视角看世界。
No man, for any considerable period, can wear one face to himself and another to the multitude, without finally getting bewildered as to which may be the true.
