1.【数】不规则四边形;梯形;【解】大多角骨
1.a shape with four straight sides that are not parallel to each other
2.a trapezoid
1.The weld section looks like an inverted trapezia and the heat affect zone (HAZ) is very narrow.
焊缝截面呈上宽下窄的倒梯形,热影响区(HAZ)相当窄;
2.The truss will compare the security status of different structure forms such as triangular roof trusses, trapezia roof trusses and so on;
桁架对比三角屋架、梯形屋架不同结构形式在同等荷载下的安全状态;