The Chinese word "垃圾桶" is formed by directly combining three characters: the first two, "垃" and "圾", are always used together as a single unit meaning "rubbish" or "trash", and they are paired with the third character "桶", which means "bucket" or "container". This creates a straightforward, literal compound where the concept of waste is attached to the object designed to hold it, resulting in a clear representation of a "trash can" through the sum of its parts.