The third resembles one of the most rampant allergens of them all, a ragweed protein that causes hay fever.
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。
Tropical diseases such as malaria, dengue fever, and yellow fever are reaching temperate regions, and ragweed and poison ivy thrive in the hothouse world.
疟疾、登革热和黄热病等热带疾病正在侵袭温带地区，豚草和毒藤也在温室气候里茁壮成长。
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