天てん敵てき関かん係けい

noun

natural enemy relationship; predator-prey relationship

Refers to the ecological relationship where one species is the natural predator or enemy of another. Often used in biology, but also metaphorically for rivalries.

• 猫ねこと鼠ねずみは天てん敵てき関かん係けいにある。

  Cats and mice have a natural enemy relationship.

• 自し然ぜん界かいでは、天てん敵てき関かん係けいが生せい態たい系けいのバランスを保たもっている。

  In nature, predator-prey relationships maintain the balance of the ecosystem.