在生物界，病毒通过传染从一个生物体扩散到另一个生物体。
In the biological world, the virus spreads from one organism to another.
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。
The invasion and spreading of alien organism caused serious economic loss in China.
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