One view is that allergies can develop as the result of childhood exposure to certain irritants, such as dust or animal dander, while the immune system is not yet mature.

一种观点认为，过敏之所以会产生，是由于人们在童年时期当免疫系统尚未成熟时曝露于某些刺激物之下，如灰尘或动物毛屑。

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If the animal kingdom held a sniffing Olympics, dogs and rats would probably battle for the gold, leaving the rest of us in the dust.

如果动物王国举行一场嗅觉奥林匹克赛的话，狗和老鼠很可能为冠军而战，其它动物就望尘莫及了。

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One view is that allergies can develop as the result of childhood exposure to certain irritants, such as dust or animal dander, while the immune system is not yet mature.

一种观点认为过敏可能会由于儿童时期免疫系统还不成熟的时候接触了某种刺激物比如灰尘或动物皮屑而导致。

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Some the more common allergens include animal fur,dust, mold and pollen.

VOA: special.2009.07.28

At age four, they were also given a skin-prick test to see if they had any of the most common allergies, including dust mite, animal fur, pollen, milk, eggs or peanuts.

BBC: Doctors could predict which children are at risk of asthma

We're in a burned-out area of Yellowstone National Park, miles from any road, surrounded by hundreds of acres of fire-blackened lodgepole pines, the hooves of our 17-animal pack train kicking up dust.

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