Hangzhou Safari Park in east China's Zhejiang Province was temporarily closed after local authorities announced on May 8 that three leopards had escaped from the zoo. A team was sent to investigate. /CFP

The highest building in Taiyuan city, north China's Shanxi Province, was lit up with the words "I love you, mom" in Chinese characters to celebrate Mother's Day, May 8, 2021. /CFP

A train conductor wears a smiling mask to welcome travelers at Nanjing Railway Station in east China's Jiangsu Province, May 8, 2021. /CFP

The first China International Consumer Products Expo opened in Haikou, south China's Hainan Province, May 7, 2021. /CFP

The World Health Organization approved the COVID-19 vaccine manufactured by China's Sinopharm for emergency use on May 7, 2021. /CFP

Yuncheng Salt Lake in north China's Shanxi Province takes on different colors, as a result of the chemical reactions between minerals and organisms, May 7, 2021. /CFP

More than 230 million trips were made domestically during China's Labor Day holiday, an increase of 119.7 percent year-on-year, according to data released by the Culture and Tourism Ministry on May 5, 2021. /CFP