“春天时，过敏原往往是树，夏天就是草地，秋天就变成杂草了，”他还补充道，整个冬天都待在家里的人也会因为灰尘或者宠物毛屑而感染过敏。

"In the spring, it's trees; the summer, grasses; and fall, weeds." Being stuck indoors all winter also may cause trouble for those allergic to dust and pet dander, he adds.

youdao

“春天时，过敏原往往是树，夏天就是草地，秋天就变成杂草了，”他还补充道，整个冬天都待在家里的人也会因为灰尘或者宠物毛屑而感染过敏。

"In the spring, it's trees; the summer, grasses; and fall, weeds." Being stuck indoors all winter also may cause trouble for those allergic to dust and pet dander, he adds.

youdao