when were electric slippers invented?who were they invented by?what are they used for?什么意
问题描述：
when were electric slippers invented?who were they invented by?what are they used for?什么意
答
电拖鞋是什么时候发明的？是谁发明的？它们有什么作用？
答
电拖鞋是何时被发明的?它们是由谁发明的?它们是用来做什么的?
答
电子拖鞋（electric slippers)是什么时候发明的?谁发明的它们?它们是用来做什么的?