Aerial photo taken on Oct. 19, 2018 shows the National Exhibition and Convention Center (Shanghai), the main venue to held the upcoming first China International Import Expo (CIIE), scheduled to be held from Nov. 5 to 10, in Shanghai, east China. (Photo: Xinhua)

Before Halloween, the Rockefeller Center Channel Gardens are transformed into a pumpkin patch garden in New York, United States,on October 19, 2018. (Photo: VCG)

The Duke and Duchess of Sussex are on their official 16-day Autumn tour visiting cities in Australia, Fiji, Tonga and New Zealand. People wait for the British royal couple to arrive at the Royal Botanic Gardens in Melbourne, Australia, on October 18, 2018. (Photo: VCG)

The Rakotzbrucke Bridge creates a perfect circle as it reflects in the perfectly calm water of the lake on October 18. The bridge, which is also called the Devil's Bridge,was specially built during the mid-19th century in Gablenz, Germany. (Photo: VCG)

A wall mural is seen near the EU Commission and Council buildings in Brussels during the EU-Asia leaders summit in Brussels, Belgium, on October 19, 2018. (Photo: VCG)

Two newborn white Bengal tiger cubs charm tourists as they clamber around the enclosure at a zoo, days into making their first public appearance in Kunming, Southern China, on October 14, 2018. (Photo: VCG)

Bishops attend a mass for the canonisation of Pope Paul VI and El Salvador's Archbishop Oscar Romero at the Vatican on October 14, 2018. (Photo: VCG)

For several days the temperature has dropped and the weather has been sunny, and Qinghai Lake has arrived at the best season to enjoy the beautiful autumn scenery on October 16, 2018. Qinghai Lake is the largest lake in China, It is known for its fascinating color changes when viewed from different angles, at different times of day, and in different seasons. (Photo: China.org.cn)

People place candles and flowers to commemorate the victims of a fatal attack on a college in the Crimean port city of Kerch, at a memorial by the Kremlin walls in Moscow, Russia. On October 17, 2018, an 18-year old student opened fire on fellow pupils and teachers and detonated an explosion before committing suicide; 21 people were killed in the attack, around 50 were injured. (Photo: VCG)