Visitors play at Liseberg, an amusement park in Gothenburg, Sweden, on July 7, 2019. (Xinhua/Fu Yiming)

People are seen during a rainfall at Liseberg, an amusement park in Gothenburg, Sweden, on July 7, 2019. (Xinhua/Fu Yiming)

Visitors play at Liseberg, an amusement park in Gothenburg, Sweden, on July 7, 2019. (Xinhua/Fu Yiming)

Visitors play at Liseberg, an amusement park in Gothenburg, Sweden, on July 7, 2019. (Xinhua/Fu Yiming)

Visitors play at Liseberg, an amusement park in Gothenburg, Sweden, on July 7, 2019. (Xinhua/Fu Yiming)

People are seen during a rainfall at Liseberg, an amusement park in Gothenburg, Sweden, on July 7, 2019. (Xinhua/Fu Yiming)