报告还说，狗在整个演化过程中始终是群居动物，狗群中存在特有的等级统治秩序。
The researchers said they found that the relative risk of being bitten by a German shepherd or a Doberman was about five times higher than for a Labrador retriever or a mixed breed.
报告还说，狗在整个演化过程中始终是群居动物，狗群中存在特有的等级统治秩序。
The researchers said they found that the relative risk of being bitten by a German shepherd or a Doberman was about five times higher than for a Labrador retriever or a mixed breed.
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