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Dating sediments using ragweed and nuclear fallout

利用豚草及核放射物对沉积物进行年代推定

Whether the trigger is pollen or ragweed , suffering during allergy season is no fun .

不管让你过敏的是花粉或者豚草，在过敏季节要经受的煎熬滋味可一点也不好。

For 75 percent of those 35 million , ragweed is the primary allergen , he added .

对于这35000000人的75%来说，豚草是首要过敏原，他补充道。

People with ragweed allergies are more likely to have a reaction to echinacea , and there have been cases of anaphylactic shock .

对豚草过敏的人更可能由紫锥菊引发生理反应，甚至有引起过敏性休克的案例。

The findings correlate with analysis last year by the national wildlife federation that found ragweed growth rates and pollen counts increased with global warming .

这些发现是基于去年国家野生动物联合会豚草的生长速度和花粉数量随着全球变暖增加的分析得出的。