A

春天，有很多地方都会有花粉和柳絮

In Spring, there are pollen and catkin everywhere.
A

在北京到处都是柳絮

There is catkin all over the Beijing.
A

很多人对它们过敏

Many people are allergic to them.
A

过敏的症状有：

allergic symptoms are:
A

打喷嚏、流眼泪、起疹子……

Sneezing, shedding tears, getting rash...
A

严重的话还有可能会呼吸困难

If it gets serious, you can have a dyspnea.
A

如果你容易过敏

If you are likely to allergy,
A

记得一定要戴口罩

please wear a mask for sure.