ulcerate的一般过去时怎么拼写？

ulcerate的现在进行时为：ulcerating...

Aspirin can ulcerate the stomach lining.阿司匹林能造成胃壁溃.In advanced stages the opaque corneas may ulcerate and even perforate.在疾病后期,不透明的角膜可能产生溃疡,甚至穿孔.The tumors are large but do not ulcerate through the skin.瘤体大但皮肤不破溃....

ulcerate的音标：ulcerate的英式发音音标为：['ʌlsəreɪt]ulcerate的美式发音音标为：['ʌlsəˌret]...

ulcerate的现在完成时为：ulcerated...

ulcerate的第三人称单数（三单）为：ulcerates...

vt.& vi.（使某物）形成溃疡，（使）腐败...