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. 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
Chewing gum on a train is not seemly in a lady. 淑女在火车上嚼囗香糖不太合适。
