At six to seven years old more than half of the children were evaluated for their sensitivity to common allergens such as dust mites, ragweed and cats.
到6至7岁时，这835名儿童中，过半的人都有各种各样的过敏症，对常见的过敏原如尘螨，豚草和猫等产生过敏。
At six to seven years old more than half of the children were evaluated for their sensitivity to common allergens such as dust mites, ragweed and cats.
到6至7岁时，这835名儿童中，过半的人都有各种各样的过敏症，对常见的过敏原如尘螨，豚草和猫等产生过敏。
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