日韩午夜精品视频,欧美私密网站,国产一区二区三区四区,国产主播一区二区三区四区

To respect the ancient origins of the Games. At that time, sports competitions were organized in Olympia and were named after their location, i.e. Olympic Games. These Games were held at the same place every four years. This four-year period acquired the name Olympiad, and was used as a date system: time was counted in Olympiads, rather than years.

(www.olympic.org)