These symptoms usually occur during certain times of the year for people with seasonal allergies, corresponding to being exposed to outdoor allergens, such as tree pollens, grasses and weeds.
这些症状通常发生在一年的某些时候，相应的被暴露在户外的过敏原，如树的花粉，草和杂草，季节性过敏的人。
These symptoms usually occur during certain times of the year for people with seasonal allergies, corresponding to being exposed to outdoor allergens, such as tree pollens, grasses and weeds.
这些症状通常发生在一年的某些时候，相应的被暴露在户外的过敏原，如树的花粉，草和杂草，季节性过敏的人。
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