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.
防晒霜已经成为在户外暴露在日光下人群的每日必需品，特别是在炎热的夏季。
Sunscreen has become a daily necessity for anyone spending time outdoors in the sun, especially during the hot summer months.
防晒霜已经成为在户外暴露在日光下人群的每日必需品，特别是在炎热的夏季。
Sunscreen has become a daily necessity for anyone spending time outdoors in the sun, especially during the hot summer months.
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