Visitors write down words in support of China's fight against the novel coronavirus at the annual Los Angeles Travel & Adventure Show in Los Angeles, the United States, Feb. 15, 2020. The two-day show kicked off here on Saturday. (Photo by Qian Weizhong/Xinhua)

A visitor writes down words in support of China's fight against the novel coronavirus at the annual Los Angeles Travel & Adventure Show in Los Angeles, the United States, Feb. 15, 2020. The two-day show kicked off here on Saturday. (Photo by Qian Weizhong/Xinhua)

A senior writes an couplets in support of China's fight against the novel coronavirus at the annual Los Angeles Travel & Adventure Show in Los Angeles, the United States, Feb. 15, 2020. The two-day show kicked off here on Saturday. (Photo by Qian Weizhong/Xinhua)

A visitor writes down words in support of China's fight against the novel coronavirus at the annual Los Angeles Travel & Adventure Show in Los Angeles, the United States, Feb. 15, 2020. The two-day show kicked off here on Saturday. (Photo by Qian Weizhong/Xinhua)