C1 noun ˈkiː.stəʊn ˈspiː.ʃiːz
keystone species
基石物种
Meaning
A species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.
Example
Wolves are a keystone species that regulate prey populations.
狼是调节猎物种群的基石物种。