n. a fungal disease of woody plants that causes localized damage to the barkn. an ulceration (especially of the lips or lining of the mouth)v. become infected with a canker
n. 溃疡, 腐蚀因素vi. 患溃疡, 腐蚀, 溃烂vt. 使患溃疡, 使腐蚀