upstream side of the injector

例句：

1. 1.The river flows through the town, and its upstream side is home to many small businesses.
   这条河流穿过这个城镇，它的上游一侧有许多小企业。
2. 2.The scientist studied the upstream side of the river for clues about the flood.
   科学家研究了河流的上游部分以寻找洪水的线索。
3. 3. The upstream side of the mountain is covered in lush greenery.
   山的上游一侧覆盖着郁郁葱葱的绿色植被。