即使有另外一种智能生物入侵地球，在那之前所有的人类踪迹也都已经无影无踪。
Even if another intelligent species evolved on Earth, almost all traces of humanity would have vanished long before.
外来种的入侵性和生境的可入侵性是研究生物入侵机制的两个关键因素。
Exotic invasiveness and community invisibility are two key factors to study the mechanism of biotic invasion.
本论文采取了野外调查和室内试验相结合的研究方法，对外来种火炬树是否对引种地生态环境构成生物入侵的问题进行了研究。
In this paper, the methods of the field investigations and laboratory testing were applied to come to a conclusion if Rhus typhina causes the biological invasion for the local environment.
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