According to Dr. Kate Welch, a specialist in immunology and allergies, it's possible that our ancestors were in serious danger when they encountered something like pollen.

根据免疫学和过敏症专家凯特韦尔奇博士的说法，当我们的祖先遇到花粉之类的东西时， 他们可能处于严重危险之中。