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.

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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。

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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吸蜜小鹦鹉一种澳大拉西亚的色彩艳丽的鹦鹉，具有刷子一样尖端的舌头，用于食花蜜和花粉。

Any of various brightly colored Australasian parrots having a tongue with a brushlike tip that is used to feed on nectar and pollen.

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