飞机在空中按照预定的航线和轨道飞行。

Fēijī zài kōngzhōng ànzhào yùdìng de hángxiàn hé guǐdào fēixíng.

The airplane flies in the air following a predetermined route and orbit.

卫星发射后，进入预定的轨道进行运行。

Wèixīng fāshè hòu, jìnrù yùdìng de guǐdào jìnxíng yùnxíng.

After the satellite is launched, it enters the predetermined orbit for operation.

地铁列车在地下轨道中快速行驶。

Dìtiě lièchē zài dìxià guǐdào zhōng kuàisù xíngshǐ.

The subway train travels rapidly in the underground track.