The Olympic Games shall be proclaimed open by the Head of State of the host country.

The delegation parade in alphabetical order according to the language of the the host country, except for Greece, which leads the parade, and for the host country which brings up the rear.

参考译文

奥运会由东道国国家元首宣布开幕。代表团按东道国语言文字的字母顺序入场。希腊和东道国例外，希腊代表团第一个入场，东道国代表团最后一个入场。