Beijing, Dec. 21, 2019 (Xinhua) -- The world in the past 24hrs. A selection of the best daily press photos from Xinhua.

Train conductors welcome passengers with hada, a traditional ceremonial scarf, next to G2412 high-speed train bound for Beijing North Railway Station, at Hohhot East Railway Station in Hohhot, capital of north China's Inner Mongolia Autonomous Region, Dec. 20, 2019. (Xinhua/Zhu Wenzhe)

Harry Moyer, a 99-year-old veteran Flying Tigers member, poses for photos with an old plane during an event honoring contributions of Flying Tigers in World War II (WWII) in San Francisco, the United States, Dec. 7, 2019. (Xinhua/Wu Xiaoling)

Protesters burn tyres to block the road in Lebanon's northern city Tripoli on Dec. 20, 2019. Protesters in Tripoli blocked roads on Friday to protest against the appointment of Hassan Diab as the new prime minister. (Photo by Khalid/Xinhua)

Palestinian protesters clash with Israeli troops on the Gaza-Israel border, east of southern Gaza Strip city of Khan Younis, Dec. 20, 2019. (Photo by Yasser Qudih/Xinhua)

Visitors are seen in front of the main snow sculpture at the exhibition area of the 32nd Harbin Sun Island International Snow Sculpture Art Exposition in Harbin, northeast China's Heilongjiang Province, Dec. 20, 2019. (Photo by Zhang Tao/Xinhua)

China's Liu Jiayu competes during the Women's Snowboard Halfpipe qualification at FIS Snowboard World Cup 2020 in Chongli, north China's Hebei Province, on Dec. 20, 2019. (Xinhua/Wang Xiao)

Penguins are seen on floating ice near China's polar icebreaker Xuelong 2, or Snow Dragon 2, in the Southern Ocean on Dec. 19, 2019. (Xinhua/Liu Shiping)

A villager dries vermicelli at Xizhuyu Village of Huoshiying Township in Tangshan, north China's Hebei Province, Dec. 20, 2019. (Xinhua/Mu Yu)

Officiated by Ho Iat Seng, the fifth-term chief executive of the Macao Special Administrative Region (SAR), members of the executive council of Macao SAR are sworn in at a gathering in celebration of the 20th anniversary of Macao's return to the motherland and the inauguration of the fifth-term government of the Macao SAR, at the Macao East Asian Games Dome in south China's Macao, Dec. 20, 2019. (Xinhua/Li Tao)

The China-Brazil Earth Resource Satellite-4A is launched on a Long March-4B carrier rocket at Taiyuan Satellite Launch Center in north China's Shanxi Province on Dec. 20, 2019. (Photo by Zheng Taotao/Xinhua)