* Simple and straightforward: "The spread of hip-hop music around the world is a clear example of cultural diffusion."
* Highlighting the mechanism: "Cultural diffusion through trade and travel brought Chinese porcelain to Europe in the 17th century."
* With a focus on impact: "Cultural diffusion can lead to both positive and negative consequences, as it can introduce new ideas but also potentially disrupt traditional practices."
* Specific to a particular aspect: "The cultural diffusion of American fast food restaurants has had a significant impact on diets worldwide."
Remember that the specific context will determine the best way to use the phrase "cultural diffusion".