To my mind, terrible diseases are surrogates for an alien invasion.
在我看来，可怕的疾病就是外星人的代理人。
Risk assessment is one of the most effective measures to prevent invasion of alien species.
外来物种风险评估是防止外来物种入侵的最有效手段之一。
The invasion and spreading of alien organism caused serious economic loss in China.
外来有害生物的入侵和扩散蔓延，给我国经济造成严重损失。
The invasion and spreading of alien organism caused serious economic loss in China.
外来有害生物的入侵和扩散蔓延，给我国经济造成严重损失。
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