n. shuttle, device that holds the horizontal thread and passes it through the vertical threads (Weaving); lower bobbin in a sewing machine; transportation route connecting two locations; vehicle that transports people over a short route

如果是 sapce  shuttle  就是航天飞机。

rocket  booster       火箭助推器。    就是飞到一定高度分离， 一节节提供动力的那几节玩意儿。