extreme or persistently high vix levels are just as unlikely because there would need to be a market expectation of very large daily spx index changes over an extended period of time extreme
极端或持续的高波动率水平同样不太可能出现，因为市场需要对标准普尔指数在很长一段时间内的每日大幅变化有一个预期
以上为机器翻译结果，长、整句建议使用 人工翻译 。