(每日一词）volatility

volatility /ˌvɑː.ləˈtɪl.ə.t̬i/  n. 波动性, 挥发性

meaning: liability to change rapidly and unpredictably, especially for the worse. 波动性

meaning: tendency of a substance to evaporate at normal temperatures. 挥发性

1) 词根：vol- 飞（转动）

2) 后缀：-atile + ity 名词后缀 (fragile,  possibility) 

补充：-ate 后缀；-ile 后缀；-ity 后缀；多个后缀合在一起，构成复合后缀，词性取决于最后一个后缀。

e.g. For the investor who knows what he is doing, volatility creates opportunity. 对于知道自己在做什么的投资者来说，波动创造机会。