"Only a small percentage of alien species cause problems in their new habitats," said Don Smith, professor of ecology and evolutionarybiology at the University of Tennessee.
田纳西大学生态学和进化生物学教授唐·史密斯说：“只有一小部分外来物种会在新栖息地引发问题。”
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"Only a small percentage of alien species cause problems in their new habitats,'' said Don Smith, professor of ecology and evolutionarybiology at the University of Tennessee.