a fungal disease of woody plants that causes localized damage to the bark
an ulceration (especially of the lips or lining of the mouth)
a pernicious and malign influence that is hard to get rid of;
"racism is a pestilence at the heart of the nation"
"according to him, I was the canker in their midst"
Verb:
become infected with a canker
infect with a canker
canker的用法和樣例：
例句
用作名詞 (n.)
Fatigue, stress or allergies can increase the likelihood of a canker sore. 疲勞，壓力或過敏能增加口腔潰瘍發作的可能性。
Anecdotal evidence suggests that diets high in sugar, citrus, and cereal grains may trigger canker sores. 有事實證據表明大量飲用糖，柑橘，穀粒或許會觸發口腔潰瘍。
用作動詞 (v.)
When with stainless steel or carbon steel, the interior must line with rubber processing, preventing to canker shell material. 用不鏽鋼或碳鋼製作時，內部需襯膠處理，以防止腐蝕殼體材料。
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