![](http://www.ecns.cn/hd/2020/02/20/5fa490673e404a39bc4a5866b296ba56.jpg)
The ballet of the Viennese state opera perform during a dress rehearsal for Vienna's traditional Opera Ball, in Vienna, Austria, Wednesday Feb. 19, 2020. (Photo/Agencies)
![](http://www.ecns.cn/hd/2020/02/20/3652bebaccca49929c54fa60a9d3fac8.jpg)
The ballet of the Viennese state opera perform during a dress rehearsal for Vienna's traditional Opera Ball, in Vienna, Austria, Wednesday Feb. 19, 2020. (Photo/Agencies)
![](http://www.ecns.cn/hd/2020/02/20/3a03d266aee0491d933be2d28f53e5a1.jpg)
The ballet of the Viennese state opera perform during a dress rehearsal for Vienna's traditional Opera Ball, in Vienna, Austria, Wednesday Feb. 19, 2020. (Photo/Agencies)