Ski fields in Zhangjiakou start to make artificial snow for Beijing 2022(1/7)

Aerial photo taken on Oct. 19, 2021 shows snowmaking machines working at a ski field in Chongli District of Zhangjiakou City, north China's Hebei Province. Ski fields in Zhangjiakou competition zone have started to make artificial snow in preparation for the upcoming Beijing 2022 Olympic Winter Games. (Xinhua/Wu Diansen)

Snowmaking machines work at a ski field in Chongli District of Zhangjiakou City, north China's Hebei Province, Oct. 18, 2021. Ski fields in Zhangjiakou competition zone have started to make artificial snow in preparation for the upcoming Beijing 2022 Olympic Winter Games. (Xinhua/Wu Diansen)

A staff member checks the snowmaking machine at a ski field in Chongli District of Zhangjiakou City, north China's Hebei Province, Oct. 19, 2021. Ski fields in Zhangjiakou competition zone have started to make artificial snow in preparation for the upcoming Beijing 2022 Olympic Winter Games. (Xinhua/Wu Diansen)

A snowmaking machine works at a ski field in Chongli District of Zhangjiakou City, north China's Hebei Province, Oct. 19, 2021. Ski fields in Zhangjiakou competition zone have started to make artificial snow in preparation for the upcoming Beijing 2022 Olympic Winter Games. (Xinhua/Wu Diansen)

A snowmaking machine works at a ski field in Chongli District of Zhangjiakou City, north China's Hebei Province, Oct. 19, 2021. Ski fields in Zhangjiakou competition zone have started to make artificial snow in preparation for the upcoming Beijing 2022 Olympic Winter Games. (Xinhua/Wu Diansen)

Snowmaking machines work at a ski field in Chongli District of Zhangjiakou City, north China's Hebei Province, Oct. 19, 2021. Ski fields in Zhangjiakou competition zone have started to make artificial snow in preparation for the upcoming Beijing 2022 Olympic Winter Games. (Xinhua/Wu Diansen)

Aerial photo taken on Oct. 19, 2021 shows snowmaking machines working at a ski field in Chongli District of Zhangjiakou City, north China's Hebei Province. Ski fields in Zhangjiakou competition zone have started to make artificial snow in preparation for the upcoming Beijing 2022 Olympic Winter Games. (Xinhua/Wu Diansen)