This is often regarded as a rhetorical sentence with metaphor, but in recent years, scientists have found that this sentence may be more than that. Human body odor can really convey a certain message! < / P > < p > however, animals don’t get into combat easily and challenge their opponents only when they have a chance to win. In order to judge whether they have a chance in the competition, they have learned 18 kinds of martial arts: “observe the words and see the colors” and smell. < / P > < p > smell is a powerful tool for them to evaluate the dominance of their opponents. For example, lower status males avoid odor markers from higher status males, because the higher status males have won and are likely to win again, and it is better to avoid them if they don’t want to be beaten up again. Similar to animals, humans compete in a variety of activities, such as boxing, Taekwondo or MMA. So, do you think the success or failure of the game will affect the body odor of athletes? Do winners smell more attractive? < / P > < p > to this end, they recruited 40 male athletes from the comprehensive fighting gymnasium in the Czech Republic. Before the start of the competition of the Czech amateur comprehensive combat league, each player is required to wear a clean T-shirt. After the game, they all put on another T-shirt. The researchers refrigerated two sweaty T-shirts to maintain their body odor. After returning to university, the researchers thawed the T-shirt, removed the underarm portion, and recruited a group of student volunteers to smell it. Volunteers then rated each T-shirt for its masculinity, intensity, pleasure and attractiveness. There’s no limit to how long you sniff, but the researchers said, “I don’t think anyone will spend too much time on this task.” < p > < p > the results showed that: no matter whether the contestants win or not, their T-shirts smell less pleasant and attractive, but they smell more masculine. However, compared with the winner, the loser’s odor pleasure decreased more significantly. The negative emotional state of athletes can explain this effect: people who lose the game produce more negative emotions, which in turn affect others’ perception of their taste attraction. Other studies have found similar results: women in stable relationships prefer the dominant male odor during ovulation, while single women and non ovulating women do not. In addition, the higher the individual’s evaluation of their own dominance, the higher the score of heterosexual on TA’s body odor dominance, but there was no significant difference in the same gender’s score of body odor dominance. From the perspective of evolutionary psychology, we can explain that for animals, choosing the more dominant opposite sex can obtain more resources, and it is more conducive to reproduction, which may be the same for humans. < / P > < p > in addition to the smell of success, the dominance of individuals and the attraction of the opposite sex, humans can also smell emotions, such as fear – < / P > < p > a research team collected sweat samples from novices before parachuting and while running on a treadmill. Participants were asked to smell the two sets of samples and conduct brain scans at the same time. The results showed that when the participants smelled the sweat collected during the parachute jump, their amygdala and hypothalamus became more active, which were closely linked to fear. < / P > < p > that is to say, when individuals smell the smell of other people’s fear, they will also produce similar emotional reactions, that is, fear. It can be seen that “smelling a trace of fear” and “smelling the breath of success” are not only exquisite language arts, but also real phenomena.