area of wetted cross-section

例句：

1. 1. The area of the lake is 20 square kilometers.
   这个湖的面积是20平方公里。
2. 2. The construction of the new highway will have a significant impact on the surrounding area.
   新高速公路的建设将对周围地区产生重大影响。
3. 3. The area of wetted cross-section is calculated using the formula for the area of a circle.
   湿断面面积的计算使用圆面积公式。