useful cross section

例句：

1. 1. The engineer designed a useful cross section for the bridge to support heavy loads.
   工程师设计了一个有用的截面来支撑桥梁上的重量。
2. 2. The new design has a useful cross section that can increase the strength of the structure.
   新设计的截面可以增加结构强度。
3. 3. The use of this material in construction is highly beneficial as it provides a useful cross sectionfor load distribution.
   这种材料在建筑中的使用非常有益，因为它为载荷分布提供了有用的截面。