The top surface of the wingbox has two skin panels, and the bottom surface has three panels.
翼盒的顶部有两块表面板材，底部有三块板材。
2
As the main load-bearing structure, wingbox is one of the main optimization objects which has great potential of weight reduction.
翼盒为机翼主要承力部件，优化潜力较大，是机翼结构优化设计的重点对象。
3
At one point during the deployment when many of the C-130Es were operationally restricted because of center wingbox cracks, we began to task our aircraft at 100 percent to test their true durability.