这家农场引进瓢虫作为生物防治手段来对付蚜虫。

The farm introduced ladybugs as a ___biocontrol measure against aphids.

农民们引入了瓢虫作为生物防治手段来控制蚜虫数量。

Farmers introduced ladybugs as a ___biocontrol method to manage aphid populations.