基本解释下弦杆应力英汉例句双语例句The bottom chord of the truss is used by pre-stress steel bar.主楼和裙房间采用大跨鱼腹桁架，桁架下弦采用高强度预应力钢棒。词组短语短语bottom m chord stress 下弦杆应力专业释义土木建筑工程下弦杆应力