English-Chinese/Many allergens such as dust or pollen are airborne particles

Many allergens such as dust or pollen are airborne particles. In these cases, symptoms arise in areas in contact with air, such as eyes, nose, and lungs.

许多过敏原如灰尘或花粉都是空气中的颗粒. 在这些情况下，症状出现在与空气接触的区域，例如眼睛，鼻子和肺部.