Although overall bird populations declined in hurricane damaged areas, some types of birds suffered more than others.
虽然遭飓风破坏地区的鸟类数量总体下降，但某些种类的鸟与其它种类相比受创更甚。
The review looked at eight different types of long-term studies and experimental trials of both human and animal populations.
这项回评着重调查了8种不同的长期研究，以及一些在人和动物身上都进行的试验。
In populations with similar skin types, the incidence of all kinds of skin cancer increases from north to south, they found.
他们发现具有相似皮肤的人群，从北向南各种皮肤癌的发病率逐步增高。
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