“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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在19世纪后期，生态学从它的自然历史和植物地理学的根源开始发展为一门独立的科学。

In the late nineteenth century, ecology began to grow into an independent science from its roots in natural history and plant geography.

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这个系统不但切合实际，从生态学观点来看也是合理的。

The system is both practical and ecologically sound.

《牛津词典》