为了让描述的事物更加生动形象,我们经常用到修辞。比如:看到朋友或熟人突然发福,我们会说他就像“充满气的气球”。这里使用了比喻和夸张。但现实是,空气真的会影响我们的体型。我们每时每刻都在呼吸,离开了空气,我们无法生存。但是,我们赖以为生的空气可能引起糖尿病和肥胖。让两个人吃一样的食物,进行一样的锻炼,但是几年后,其中的一个可能因为自己周围的空气而重量增加,新陈代谢变差。研究人员用小白鼠进行了实验。他们把小白鼠分为 In order to make the description of things more vivid, we often use rhetoric. For example: See friends or acquaintances suddenly fat, we will say he is like “full of balloons ”. Here used the metaphor and exaggeration. But the reality is that the air really affects our body size. We breathe every moment, leaving the air, we can not survive. However, the air we rely on may cause diabetes and obesity. Let two people eat the same food for the same workout, but in a few years one of them may have increased weight and decreased metabolism due to the air around them. Researchers experiment with mice. They divided the mice