_:na7973e2c05f148ffb699486e6c3b8e5bxb0
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/WebSite>
<https://champ.hackers.com/?r=champstudy&c=lecture%2Flec_foreign&sub=detail&lec_id=15032>