[ C or U ] specialized biology a disease that attacks the wood of trees(树木的)溃疡病,枝枯病,根瘤病
[ U ] specialized biology a disease affecting the ears and mouth of animals and humans(动物或人耳部或嘴部的)溃疡,痈,疮
[ C usually singular ] formal something evil that spreads through a person's mind, an organization, or a society(蔓延的)腐败;祸患;弊病
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