How to Win Friends and Influence People

How to Win Friends and Influence People 如何赢得朋友并影响众人（人性的弱点）？ 1.  如何建立和谐的人际关系？如何影响周围的人更积极、更阳光？ 2.  Why can harmonious interpersonal relationship make people healthier and happier! 3.  What are 6 ways to get people to like you?  4.  What are 12 ways to be a more persuasive person? 5.  What are 9 ways to change the behavior of others without offending them?