Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday. (Photos: Xinhua)

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.

Kite enthusiasts fly their kites at the opening ceremony of the 36th Weifang International Kite Festival in Weifang, east China's Shandong Province, April 20, 2019. The annual kite gala kicked off here Saturday.