<https://www.dinolingo.com/why-should-children-learn-a-second-language-at-an-early-age/#breadcrumblist>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://dinolingo.com/ko/why-should-children-learn-a-second-language-at-an-early-age/>