A worker constructs bridge beams for the Mojiang-Lincang highway in Zhenyuan Yi and Hani and Lahu Autonomous County, southwest China's Yunnan Province, April 13, 2020. Under comprehensive measures against the epidemic outbreak, workers here construct bridge beams for the Mojiang-Lincang highway, a 236-km-long expressway connecting Mojiang Hani Autonomous County to Lincang City in Yunnan Province, at full stretch to ensure the highway's opening to traffic by the end of 2020. (Xinhua/Yang Zongyou)

A worker constructs bridge beams for the Mojiang-Lincang highway in Zhenyuan Yi and Hani and Lahu Autonomous County, southwest China's Yunnan Province, April 13, 2020. Under comprehensive measures against the epidemic outbreak, workers here construct bridge beams for the Mojiang-Lincang highway, a 236-km-long expressway connecting Mojiang Hani Autonomous County to Lincang City in Yunnan Province, at full stretch to ensure the highway's opening to traffic by the end of 2020. (Xinhua/Yang Zongyou)

A worker constructs bridge beams for the Mojiang-Lincang highway in Zhenyuan Yi and Hani and Lahu Autonomous County, southwest China's Yunnan Province, April 13, 2020. Under comprehensive measures against the epidemic outbreak, workers here construct bridge beams for the Mojiang-Lincang highway, a 236-km-long expressway connecting Mojiang Hani Autonomous County to Lincang City in Yunnan Province, at full stretch to ensure the highway's opening to traffic by the end of 2020. (Xinhua/Yang Zongyou)

Aerial photo taken on April 13, 2020 shows workers constructing bridge beams for the Mojiang-Lincang highway in Zhenyuan Yi and Hani and Lahu Autonomous County, southwest China's Yunnan Province. Under comprehensive measures against the epidemic outbreak, workers here construct bridge beams for the Mojiang-Lincang highway, a 236-km-long expressway connecting Mojiang Hani Autonomous County to Lincang City in Yunnan Province, at full stretch to ensure the highway's opening to traffic by the end of 2020. (Xinhua/Yang Zongyou)

Aerial photo taken on April 13, 2020 shows workers constructing bridge beams for the Mojiang-Lincang highway in Zhenyuan Yi and Hani and Lahu Autonomous County, southwest China's Yunnan Province. Under comprehensive measures against the epidemic outbreak, workers here construct bridge beams for the Mojiang-Lincang highway, a 236-km-long expressway connecting Mojiang Hani Autonomous County to Lincang City in Yunnan Province, at full stretch to ensure the highway's opening to traffic by the end of 2020. (Xinhua/Yang Zongyou)

A worker constructs bridge beams for the Mojiang-Lincang highway in Zhenyuan Yi and Hani and Lahu Autonomous County, southwest China's Yunnan Province, April 13, 2020. Under comprehensive measures against the epidemic outbreak, workers here construct bridge beams for the Mojiang-Lincang highway, a 236-km-long expressway connecting Mojiang Hani Autonomous County to Lincang City in Yunnan Province, at full stretch to ensure the highway's opening to traffic by the end of 2020. (Xinhua/Yang Zongyou)

Workers construct bridge beams for the Mojiang-Lincang highway in Zhenyuan Yi and Hani and Lahu Autonomous County, southwest China's Yunnan Province, April 13, 2020. Under comprehensive measures against the epidemic outbreak, workers here construct bridge beams for the Mojiang-Lincang highway, a 236-km-long expressway connecting Mojiang Hani Autonomous County to Lincang City in Yunnan Province, at full stretch to ensure the highway's opening to traffic by the end of 2020. (Xinhua/Yang Zongyou)