Zhu Ting (L) of China spikes the ball during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Zhu Ting (R) of China spikes the ball during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Ding Xia (L) of China celebrates during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Yuan Xinyue (L) of China spikes the ball during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Li Yingying (L) of China spikes the ball during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Players of China celebrate after a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Head coach of China Lang Ping gestures during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Miroslava Paskova (C) of Bulgaria spikes the ball during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Zhu Ting of China spikes the ball during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Hu Mingyuan (L) of China spikes the ball during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Ding Xia (L) and Yuan Xinyue of China spikes the ball during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Players of China celebrate during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Zhu Ting of China serves the ball during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Zhu Ting of China spikes the ball during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)

Head coach of China Lang Ping gives instructions during a match between China and Bulgaria at the FIVB Volleyball Nations League 2019 in Ningbo, east China's Zhejiang province, June 19, 2019. (Xinhua/Huang Zongzhi)