Here's why:
* Metonymy is a figure of speech where a word or phrase is used to stand in for another word or phrase that is closely related to it.
* In this case, "two worlds" isn't literally referring to two planets or physical locations. Instead, it's a metaphorical way of representing two very different and perhaps contrasting experiences or lifestyles.
For example, "Some of us had two worlds" could be referring to:
* Living in two different cultures: One person might have grown up in a rural, traditional environment and then later moved to a bustling, modern city.
* Having both a privileged and a less privileged existence: Someone might have access to wealth and opportunities but also have experienced poverty or hardship.
* Experiencing both joy and sorrow: A person might have known great happiness but also endured significant loss or pain.
By using "two worlds," the speaker creates a powerful image that evokes these complex and contrasting realities.