upward flow

例句：

1. 1. The river flows upward from the valley.
   这条河流从山谷中向上流。
2. 2. The airflow upwards in this room is very strong.
   这间房间里的空气流动非常强。
3. 3. The water flowed upwards to fill the reservoir.
   水流向上流，填满了水库。