deep seated stain

例句：

1. 1.The stain on the table is so deep that it's hard to clean up.
   桌子上的污渍太深了，很难清理干净。
2. 2. She was deeply seated in her thoughts about the upcoming meeting.
   她深深地陷入了对即将到来的会议的思考中。
3. 3.The stain on the carpet is a result of years of neglect.
   地毯上的污渍是多年忽视的结果。