如某些两栖动物即使在完全成熟并已经度过水中生活的时期后仍然保留有鳃。
For example, certain amphibians retain fishlike gills even when fully mature and past their water-inhabiting period.
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。
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。
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.
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