Her mother has been fastened to it as a means of tugging her along to keep step with the rush of other shoppers.
参考译文:她的妈妈被拴在皮带上以便于拉着她走在匆忙赶来的其他顾客中间。
备注: as a means of tugging her along to keep step with the rush of other shoppers.为介词短语作目的状语。结构为:as a means of doing sth 作为做某事的方式。
以上句子整体语法结构为
Her mother【主语】// has been fastened【谓语动词】// to it【状语】// as a means of tugging her along to keep step with the rush of other shoppers【目的状语】//.