切、磋、琢、磨：将骨、角、玉、石一类磨制成器物。好像把骨角玉石加工成器物那样。比喻共同商讨，互相砥砺。
As knife and file make smooth the bone, so jade is wrought by chisel and stone.
如(rú)
切(qiē qiè)
磋(cuō)
()
琢(zhuó zuó)
磨(mó mò)
