副驾驶在长途飞行中与机长轮流操控飞机。

The ___co-pilots take turns with the captain to control the plane during long flights.

他下周将要首次作为副驾驶执飞国际航班。

He will be ___co-piloting an international flight for the first time next week.

在乐队演出时，键盘手是主唱的得力助手。

During the band's performance, the keyboardist acted as the singer's ___co-pilot.