花粉引起的变应性鼻炎 Allergic rhinitis due to pollen
雪边分红是由一种只能通过显微镜才能看到的藻类和白皮巴尔干松的叶子、花粉引起的。
The snow turns pink because of microscopic algae known as Chamydomonas nivalis, leaves and pollen of the whitebark pine.
这是因为在引起人们过敏的白桦树花粉中找到的蛋白质和在苹果果肉中发现的很类似。
This is because the protein found in birch pollen to which people are allergic is very similar to proteins found in the flesh of apples.
过激的免疫系统也是引起过敏的原因，本来无害的物质(如花粉)会引起不必要的免疫反应。
An over-reactive immune system is also the cause of allergies, where a harmless agent (such as pollen) can lead to an unnecessary immune response.
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