革新
船坞
船坞是最基本的海岸基础设施，可用于建造和修理船只。
商人与贸易革新requires革新树
定义in_game/common/advances/1_building_unlocks.txt:728
735ai_weight = {
736if = {
737limit = {
738has_ports = yes
}
740add = {
741value = 200
742multiply = num_of_ports
743divide = num_locations
}
}
}
748ai_preference_tags = {
exploration
}