volatility的甄选

词源是volatil+ity词缀，中文意思是n.易变，活泼挥发性例如Volatilitycanbemeasuredintwoways.衡量波动率有两种方法。Theresultisvolatilityinfoodprices.其结果导致了粮价的波动。Alittlebitofvolatility，too.一点点波动...