Workers work in the tunnel of Longtan Station of Metro Line 18 in Guangzhou, south China's Guangdong Province, April 20, 2021. Track construction was completed on Tuesday from Wanqingsha to Xiancun village, marking a major progress for the Metro Line 18 in Guangzhou, the fastest metro line within Guangdong-Hong Kong-Macao Greater Bay Area with a maximum designed speed of 160 km per hour. (Xinhua/Liu Dawei)
