词根alle，相异，不同。词根gen, 产生。

1. Objective To find out the common allergen of abnormal rhinitis in Shenzhen.

目的了解深圳地区变应性鼻炎的常见变应原.

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2. To investigate the allergen distribution and characteristic in hypersensitive children.

了解儿童变态反应性疾病患者过敏原分布情况及特点.

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3. When the immune system encounters an allergen , it may become sensitised.

当免疫系统发现了过敏原就会致敏.

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4. Long - term exposure to this medicine may sensitize you to the allergen.

长期使用这种药可能会使你易于过敏.

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5. To make matters worse, the allergen involved seems to be particularly potent.

更糟糕的是, 这种复杂过敏原的威力似乎特别强.

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[ allergen 造句 ]