We all know that smiling is important when meeting new people. However, new research（研究） suggests that 【小题1】 types of smiles have a great impact（印象） on what people think of us.

There are a great number of sayings about the 【小题2】 of smile. ‘Peace begins with a smile.’‘ A smile is the best welcome.’ ‘Life is short but a smile only takes a second.’ They are all good suggestions. But it may not be as 【小题3】 as that. According to new research, if you want to make a good impression（印象） when you meet people, it’s not just that you smile. It’s 【小题4】 you smile.