CLEAN : Brazil's Baré indigenous people get second dose of Sinovac's shot

The video tutorial covers various topics, starting with initial thoughts and remarks. It then moves on to discuss transport and submission processes, followed by a talk on ordinary users and language. The tutorial also provides an overview of statements and dashboards before concluding with final remarks.

What does the phrase 'language. Who?' imply in the context?

What can be inferred from the statement about 'public key'?