Answer:
It means you are unaware of something
Explanation:
She unwittingly walked in the wrong house
Gertrude Stein, patron of the arts, was a voluble conversationalist when artists and writers visited her Paris apartment in the 1920s and 1930s.
Form google dict., voluble means <em></em><span><em>Speaking or spoken incessantly and fluently.</em></span>
Internet addiction can cause people to be less social.
Internet addiction can be found among a variety of age groups, not just teenagers and young adults.
Internet addiction is linked to obesity./ Internet addiction can aid in becoming obese.
Internet addiction can cause people to come into more contact with content that negatively impacts brain health. (ex. cyber bullying, people who want to commit suicide, hate websites, websites promoting disorders such as anorexia, etc.)
I hope this answered your question or at least helped.
I’m not sure what portion you’re referring to, but I would say that he uses the rhetorical device of repetition most effectively, as he repeats “I have a dream”.