upstreamcofferdam

例句：

1. 1. The river flows through the town and its upstream area is famous for its beautiful scenery.
   这条河流穿过这个城镇，它的上游地区以美丽的风景而闻名。
2. 2.The scientists studied the upstream water quality to determine the source of pollution.
   科学家们研究了上游水质来确定污染的来源。
3. 3.The upstream development plans have been put on hold due to concerns over environmental impact.
   由于对环境影响的担忧，已经暂停了上游的开发计划。