These are all words for a small area of dirt or another substance on a surface. 以上各词均指污点、斑点、污迹。

• mark a small area of dirt or other substance on the surface of sth, especially one that spoils its appearance 指污点、污迹、斑点：◆The kids left dirty marks all over the kitchen floor. 孩子们把厨房的地板弄得污迹斑斑。
• stain a dirty mark on sth that is difficult to remove, especially one made by a liquid 指污点、污渍：◆blood stains 血迹
• fingerprint a mark on a surface made by the pattern of lines on the end of a person's finger, often used by the police to identify criminals 指指纹、指印：◆Her fingerprints were all over the gun. 那支枪上布满了她的指纹。
• streak a long thin mark or line that is a different colour from the surface it is on 指条纹、条痕：◆She had streaks of grey in her hair. 她头上已是白发绺绺。
• speck a very small mark, spot or piece of a substance on sth 指小点、污点：◆There isn't a speck of dust anywhere in the house. 整间房子一尘不染。
• blot a spot or dirty mark left on sth by a substance such as ink or paint being dropped on a surface 指污点、墨渍
• smear a mark made by sth such as oil or paint being spread or rubbed on a surface 指污迹、油渍、污渍、污点
• spot a small dirty mark on sth 指污迹、污渍、污点：◆There were grease spots all over the walls. 墙上满是油渍。

Patterns

• a streak/speck/blot/smear/spot of sth
• a greasy mark/stain/smear
• an ink mark/stain/blot/spot
• a grease mark/stain/spot
• to leave a mark/stain/fingerprint/streak/speck/blot/smear