美国一项最新研究结果显示 ,积极的心态有助于预防感冒。研究人员对 334名志愿者进行了实验 ,这些人在实验前都没有病。研究人员在实验开始时花了 2周时间对志愿者们进行访谈 ,让他们描述自己的情绪 ,然后在此基础上将这些志愿者归入积极情绪和消极情绪 2类 ,并据不同的程度分 A recent U.S. study shows that a positive attitude helps prevent colds. The researchers conducted experiments on 334 volunteers who were not ill before the experiment. The researchers spent two weeks at the beginning of the experiment interviewing volunteers so that they could describe their emotions and then classifying these volunteers into two categories of positive emotions and negative emotions,