树木花粉
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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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