ferocity
词根词缀：
feral adj. 野生的；凶猛的
fer 野 + al …的，具有…性质的 → 野生的；凶猛的
ferocious adj. 凶猛的，残暴的
fero 野 + cious → 野蛮的 → 残暴的
ferocity n. 凶猛
fero 野 + city → 野蛮 → 凶猛
furor n. 盛怒
fur 野 + or 状态 → 气得发狂 → 盛怒
furore n. 狂怒；狂热
fur 野 + ore → 狂怒；狂热
fury n. 狂怒，暴怒
fur 野 + y 表状态 → 狂怒，暴怒
数据来源：新东方英语词汇速记大全
相关例句：
The answer is: focus and ferocity.
答案是：专注和坚决。
His pale gray eyes were gleaning with ferocity and triumph.
他那淡灰色的眼睛里闪着残忍和胜利的光芒。
Featuring unparalleled ferocity and iron discipline, they can be mustered on a moment's notice.
以举世无双的残暴和铁一样的纪律为特征，他们可以在收到通告后极短的时间内集合起来。
The hissing of the serpent shall strike back at this world with unexpected ferocity.
蛇的吐舌声会凶猛的突击这个世界。
I don't like cocks because of the ferocity.
因为公鸡凶猛所以我不喜欢。
From living a softer life, both sexes also began to lose something of their strength and ferocity.
由于得到了一种比较舒适的生活，两性都开始失去一部分强悍性和气力。