People attend a celebration of Masopust in Roztoky, the Czech Republic, on Feb. 15, 2020. Masopust is a traditional Czech carnival. During this festival, people wear masks and dress up in costumes to celebrate the start of spring and bid farewell to winter. (Photo by Dana Kesnerova/Xinhua)

People attend a celebration of Masopust in Roztoky, the Czech Republic, on Feb. 15, 2020. Masopust is a traditional Czech carnival. During this festival, people wear masks and dress up in costumes to celebrate the start of spring and bid farewell to winter. (Photo by Dana Kesnerova/Xinhua)

People attend a celebration of Masopust in Roztoky, the Czech Republic, on Feb. 15, 2020. Masopust is a traditional Czech carnival. During this festival, people wear masks and dress up in costumes to celebrate the start of spring and bid farewell to winter. (Photo by Dana Kesnerova/Xinhua)

People attend a celebration of Masopust in Roztoky, the Czech Republic, on Feb. 15, 2020. Masopust is a traditional Czech carnival. During this festival, people wear masks and dress up in costumes to celebrate the start of spring and bid farewell to winter. (Photo by Dana Kesnerova/Xinhua)

People attend a celebration of Masopust in Roztoky, the Czech Republic, on Feb. 15, 2020. Masopust is a traditional Czech carnival. During this festival, people wear masks and dress up in costumes to celebrate the start of spring and bid farewell to winter. (Photo by Dana Kesnerova/Xinhua)