翻译：为尽可能排除无关因素对实验的影响研究区域应作为一个独立的排水片区区域内排水管道雨污分流彻底污水管道内部无淤堵且保持低水位正常运行状态无地下水或湖水入侵至污水管网现象。经现场调查、测绘与检测确认选取中国天津市某区域整个区域占地1538077平方米。该区域内共有办公类、住宅类及餐饮类三种建筑类型经统计包含洗漱行为、淋浴行为、舆洗室行为、餐厨行为及餐具清洗行为对研究区域内涉及不同的用水行为进行布点

To minimize the influence of irrelevant factors on the experiment, the research area should be an independent drainage area, with separate rainwater and sewage systems and no blockage or intrusion of groundwater or lake water into the sewage system. After field investigation, mapping, and testing, a certain area in Tianjin, China was selected, covering an area of 153807.7 square meters and containing three types of buildings: offices, residences, and restaurants. By monitoring and analyzing different water usage behaviors, including washing, showering, toilet flushing, cooking, and dishwashing, the impact of these behaviors on the δ34S of tap water and the change pattern of δ34S at the end of the monitoring area were discussed. The detailed water usage behaviors are shown in Table 1