一只走鹃在仙人掌丛中快速奔跑。

A ___roadrunner was running swiftly among the cacti.

我们学校的足球队取名为'跑跑鸟'，因为队员们都以速度和灵活性著称。

Our school's soccer team is named the ___Roadrunners because all players are known for their speed and agility.