Ulcerating
v. （使某物）形成溃疡( ulcerate的现在分词 ); （使）腐败
🗣️ 情景例句
No problem, Grandpa.
没有关系爷爷。
The police crept up from behind and took the gangster by surprise.
警察悄悄从背后绕过去，出其不意地将歹徒逮捕。
Some of this heat near the earth's surfact is used to make electricity.
靠近地表的一部分热量已被用来发电。