Wu Dajing, who won China’s only gold medal at the 2018 Winter Olympics, has retired after failing to qualify for next month’s Games in Italy. The short track speed skater secured gold in the men’s 500 metres, setting a then world record time of 39.584 seconds in Pyeongchang eight years ago, and also claimed silver in the 5,000m relay in South Korea. He was later part of the China team that won the mixed 2,000m relay at the 2022 Beijing Olympics. Wu said he considered retiring four years ago but...