frown,flexible

股票价格的波动率微笑曲线如下图: 并不是微笑smile,而是皱眉frown.
scared frown face clipart
idioms & phrases think of n./ving frown on sth.
never frown, even when you are sad, because you never know who
【预订】the frown of majesty: a romance of the days of louis the