变态反应原的组合可能导致叠加性作用，例如。

Combinations of allergens can result in additive effects, for instance.

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变态反应原，过敏原一种可引起过敏的物质，如花粉。

Transfer of pollen from one plant to another; cross-pollination.

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今年，一些地区正在报道高花粉量的记录。这些大量的黄色粉尘样的变态反应原确实影响了人们的呼吸。

This year, some areas are reporting record-high pollen counts, which are sure to impact the people breathing that yellow, dust-like allergen.

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