表1列出世界一些城市下水道普及率情况。由下表可见,一些工业发达国家的大城市下水道普及率都较高,而东方国家几个城市的下水道普及率比较低,极需赶上去。表2也说明这些情况。 Table 1 lists the sewer penetration rate in some cities in the world. As can be seen from the table below, the penetration rate of sewers in large industrial cities in some industrialized countries is relatively high, while the penetration rate of sewers in several cities in eastern countries is relatively low and it is extremely necessary to catch up. Table 2 also illustrates these conditions.