大溃疡是更为严重，有一个不规则的边界，并能在过去五至十个星期。

Large ulcers are more severe, have an irregular border, and can last for five to ten weeks.

youdao

大溃疡是更为严重，有一个不规则的边界，并能在过去五至十个星期。

Large ulcers are more severe, have an irregular border, and can last for five to ten weeks.

youdao