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。”

"Only a small percentage of alien species cause problems in their new habitats," said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee.

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“只有一小部分外来物种会在它们的新栖息地引发问题。”田纳西大学生态学和进化生物学教授唐·史密斯说。

"Only a small percentage of alien species cause problems in their new habitats,'' said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee.

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斯坦福大学细胞生物学教授皮特帕汉说，“NK细胞对人类是否得病至关重要。”

"They can make a big difference as to whether you get sick, or you don't get sick, " says Peter Parham, a professor of cell biology at Stanford.

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PROFESSOR: Biology, yes.

教授：是的，生物学。

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