梯形 梯形的英文 英语翻译 echelon; ladder-shaped; trapezium; trapezoidkeystone shaped; ladder 拓展翻译 梯形波trapezoidal wave梯形产生器staircase generator; trapezoidal generator梯形的trapezidal; trapezoid梯形法keystoning梯形敷布graduated compress梯形畸变keystoning梯形夹ladder splint梯形聚合物ladder polymer梯形螺纹Acme screw thread梯形螺纹攻acme thread tap梯形滤波器trapezoidal filter梯形脉冲trapezoidal pulse梯形目标mire梯形失真keystoning梯形试片step-bar test piece; stepped test bar梯形衰减器ladder attenuator梯形体trapezoid梯形图ladder chart梯形图案trapezoidal pattern梯形网络ladder network