校车每天在几个社区之间来回接送学生。

The school bus ___shuttles students between several neighborhoods every day.

校车每天接送学生在学校和宿舍之间往返。

The school bus ___shuttles students between the campus and dormitory daily.

机场免费摆渡车每15分钟一班，往返于航站楼和停车场之间。

The free airport ___shuttles run every 15 minutes between the terminal and the parking lot.

织布时，梭子快速地在经线之间来回穿梭。

The weaver moves the ___shuttle quickly between the threads.