菠萝蜜中的过敏原不会使免疫系统敏感，但是一旦桦树花粉刺激了免疫系统，免疫系统也会对菠萝蜜有反应。
The allergen in jackfruit does not sensitize the immune system, but once birch pollen has done so, the immune system may react to jackfruit too.
第三个与造成花粉过敏的豚草蛋白类似，该蛋白可说是过敏原里最厉害的一个了。
The third resembles one of the most rampant allergens of them all, a ragweed protein that causes hay fever.
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.
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