This photo taken on Feb. 26, 2025 shows the construction site of the Beijing sub-center comprehensive transportation hub in Tongzhou District, sub-center of Beijing, capital of China. The construction of the Beijing sub-center comprehensive transportation hub, Asia's largest underground transportation complex, is proceeding smoothly. The hub will link cross-regional and intercity railways, and several metro lines when completed as scheduled by the end of 2025. (Xinhua/Ju Huanzong)