This also explains why some migrants from east Asia to northern Europe suddenly develop an allergic reaction to jackfruit once they have come into contact with birch pollen.
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美
- 这也解释了为什么来自东亚的某些移民,到了北欧后,一旦接触到桦树花粉,会突然出现菠萝蜜过敏反应的现象。