Four times. Tianjin Rivers and Lakes Office conducts training at least four times a year, and conducts training four times a year according to regulations. Tianjin, referred to as Jingu and Jinmen for short, is a provincial-level administrative region, municipality directly under the Central Government, national central city and megacity in People's Republic of China (PRC), a gateway to the opening up of northern China approved by the State Council, and a shipping center, logistics center and modern manufacturing base in northern China.