horizontal flow

例句：

1. 1. The river has a horizontal flow across the valley.
   这条河流在山谷中横向流动。
2. 2. The horizontal flow of water is essential for the growth of plants.
   水的水平流动对植物的生长至关重要。
3. 3.Horizontal flow is an important factor in determining the distribution of nutrients in soil.
   水平流动是决定土壤中养分分布的重要因素。