外來種生物的引入，最直接的危害為掠食當地物種，使原生物種族群數量銳減。

外來種生物的引入，最直接的危害為掠食當地物種，使原生物種族群數量銳減。

結果 (英文) 1:

Introduction of exotic species of creatures, the most direct harm to local predatory species, the sharp drop in the number of protozoa ethnic groups.

結果 (英文) 2:

The introduction of alien species is most directly harmful to predatory native species, resulting in a sharp decline in the number of native species.

結果 (英文) 3:

The most direct harm caused by the introduction of alien species is that they prey on local species, which sharply reduces the number of protozoa.