ulcerate|ulcerated

如果不及时治疗，伤口可能会溃烂。

The wound may ___ulcerate if not treated promptly.

他的牙龈因为长期感染已经溃疡了。

His gums became ___ulcerated after prolonged infection.

这种酸性物质长期接触会腐蚀皮肤并导致溃疡。

Prolonged exposure to this acid can ___ulcerate the skin.