The urban environment is a mosaic of man-made, natural and seminatural habitats with climatic and hydrological conditions, which distinguish it from adjacent rural areas. 城市环境是一个人造的、自然的和半自然的生境镶嵌体，与邻近乡村地区的气候和水文条件完全不同。
barter peculiar to a seminatural economy 半自然经济的物物交换
