alien species invasion

• 外来物种入侵

alien species invasion的用法和样例：

例句

1. If the species of the original system have been lost or invaders have appeared, the former pristine conditions may never be regained.
   如果原本生态系中的物种消失了，或有外来物种入侵，这个生态系可能永远无法回复原貌。