Imagine that an alien species landed on Earth and, through their mere presence, those aliens caused our art to vanish, our music to homogenize, and our technological know-how to disappear.
想象一下，外星物种登陆地球，而他们的存在会让我们的艺术消逝，同化我们的音乐，也让我们的技术知识消失了。
Ecologists generally define an alien species as one that people, accidentally or deliberately, carried to its new location.
生态学家通常把外来物种定义为人们偶然或故意带到新地方的物种。
So let's imagine that we suddenly stand face-to-face with members of an alien species. What would we do first?
那么来想象一下当我们突然面对某一外星物种的成员时，首先要做的是什么？
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