calc=stone,表示“石头”
calculate v 计算(calc+ulate)
calcfy n 钙化;僵化(calc+ify)
recalcitrant a 顽固的;不服从的(re重新+|calc+itrant表形容词→重新变成石头顽固的)
calcium n 钙(cale+ium表名词,常指化学元素,如;alu-minium铝)