happy is a very important thing o...if someone dun happy she/he will feel that evervything is bad....although ''happy''is easy to say,but is is difficult to do...

开心很重要哦，一个人不开心的时候，他/她会觉得所有的事情都很糟。。。‘开心’这两个字虽然容易写，但要做到就很难。。。