n.门阶；厚三明治或面包；v.上门访问； 变形： 复数：doorsteps过去式：doorstepped过去分词：doorstepped现在分词：doorstepping第三人称单数：doorsteps 英英释义： doorstep[ 'dɔ:step ]n.the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing th