Jargon refers to language that is very specific to a particular context, and is often not understood outside that context. Jargon is most often used to refer to technical language that belongs to a particular occupation. Therefore, texts that employ too much jargon might not be read outside of that particular group or industry as the language might be too difficult for outsiders to understand.
This is a simile as it compares two things using the word like. It compares her running across the grass to a cheetah chasing its prey, implying she is running very fast
