(单词翻译:单击)
185.serr=saw,表示"锯子"
serrated a 锯齿状的(serr+ate+ed→像锯子一样)
serration n 矩尺状(serr+ation)
serried a 拥挤的,密集的(serri+ed→像锯齿一样密集的)