流胶现象，流胶病某些植物上，如甘蔗及一些果树，形成胶质斑块的病理现象，由病虫害、微生物或恶劣的气候条件侵袭而引起 The pathological formation of patches of gum on certain plants, such as sugar cane and some fruit trees, resulting from attack by insects, microorganisms, or adverse weather conditions.
这种疾病能引起面部色素斑沉著。 The disease causes patches of pigmentation on the face.
需刷牙以去除牙斑。 It is necessary to remove plaque by brushing one's teeth.
