Beijing Week at Italy's world exposition, Expo Milano 2015, closed on Wednesday with the promotion of Beijing's candidacy for the 2022 Winter Olympic Games.

As part of the closing ceremony, Chinese freestyle skier Li Nina sang Heart, the theme song of Beijing's bid for the Winter Olympics, in front of an audience of Expo visitors.

"As an athlete of winter sports, I particularly wish for the 2022 Winter Olympic Games to be held in my home country, China," Li said, adding that she was honored to be an ambassador for Beijing's bid.