(250324) -- NAIROBI, March 24, 2025 (Xinhua) -- Anaclaudia Rossbach (L), executive director of UN-Habitat, shakes hands with Zheng Qinghua, president of China's Tongji University, at the signing ceremony of a letter of intent in Nairobi, Kenya, on March 24, 2025. The United Nations Human Settlements Program (UN-Habitat) and China's Tongji University signed a letter of intent on Monday in Nairobi to strengthen cooperation in sustainable urban development. (Xinhua/Han Xu)