“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.
他走在更高的草地和杂草中。
更糟糕的是，它慢慢变成一个生长过度的杂草地。
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