The danger with a lengthening season—and perhaps a more intense one—is pollen's potential to overwhelm immune systems that, up till now, have withstood the onslaught, Tringale said.

延长了的季节带来的危险中或许是最令人紧张的一个，是花粉破坏免疫系统的潜力，到今天，还算抵抗住了这猛攻。

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Taking medications before the pollen onslaught can help people get ready for the allergy season, Tringale said.

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But making allergy season really unpredictable is the role of weather, said Mike Tringale with the Asthma and Allergy Foundation of America.

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