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)