In the are of vocabulary and meaning, the color spectrum is a well-known example. as clearly discussed by Fasold and Connor-Linton, color variation is a continuum - red to red-orange to orange to yellow-orange to yellow and so on through the spectrum. All languages divide the color spectrum into discrete categories, and yet they differ in the way they divide it. In some languages, they are only two basic color terms: light and dark. In other languages including English, they have perceived the distinction among many more colors, e.g., green, blue, red, and so on
Therefore, in all lamguages, continuous stream of speech can be divided into seperate individual units, which themselves can be further divided into distinct smaller units. Distinctions between these units very from language to language. Speakers do not have a problem of distinguishing linguistic units in their language.