单语范例（未经PONS编辑处理）
Additionally, some patients in active treatment worry that the fatigue indicates treatment failure, and this anxiety may increase their fatigue in a vicious cycle.
en.wikipedia.org The hatred she had for the two caused her to lose her beauty and become a vicious spirit that plagues the village.
en.wikipedia.org While they are herbivores by nature, they are often fed meat to make them vicious and are then used for exhibition sport as execution animals.
en.wikipedia.org This meant that the most vicious gossip who spread the details around was not subject to the law, but supposedly a newspaper was.
en.wikipedia.org The race to the bottom becomes a vicious circle with states competing to deregulate even further resulting in major human rights problems.
en.wikipedia.org