【请问应该怎么理解whatremainedofabottleofmedicine从句是新四里的一课：hewentoffimmediatelytovisithim,carryingwithhiminhispocket【whatremainedofabottleofmedicine】formerlyprescribedforanindispositionofMr】

　　请问应该怎么理解whatremainedofabottleofmedicine从句

　　是新四里的一课：hewentoffimmediatelytovisithim,carryingwithhiminhispocket【whatremainedofabottleofmedicine】formerlyprescribedforanindispositionofMrs.Carlyle's.

　　括号中由疑问词What引导的从句和一般的“疑问词+主语+谓语动词+句子剩余部分”的从句不同.如：Carlylewasentirelyignorantofwhatthebottleinhispocketcontained.

　　这种从句应该怎样分析、理解?并请给我几个例句.