What got their dander up?
谁了?
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Pollen is a common offender, just because we encounter so much of it, but there's a long list of substances: dust, animal dander, insect venom, medications, certain foods, that can send your immune system into overdrive.
花粉是常见的入侵者,是因为我们经常能够遇到,但还有很多其他类似的质:如灰尘,动屑,昆虫毒液,药,特定食,它们会使得你的免疫系统过度工作。