The word "某些" is formed by combining the character "某", which functions as a demonstrative meaning "certain" or "unspecified", with the character "些", a measure word that denotes a small amount or plural. This combination results in a compound determiner that means "certain ones" or "some", used to refer to particular but unspecified items from a group, directly merging the indefinite reference of the first character with the quantitative sense of the second.