a white dress的用法和样例：
- A white dress gets dirty very fast.
- The older lady was wearing a white dress decorated with lavender ribbon.
- The young lady at the window was in a white dress with a touch of pink chiffons at her neck and wrists.
- Sorry,I don't know the (lad)by the _(lady) in a white dress.
- The older lady is wearing a white dress decorated with lavender ribbon.