基本解释下弦杆應力英汉例句雙語例句The bottom chord of the truss is used by pre-stress steel bar.主樓和裙房間採用大跨魚腹桁架，桁架下弦採用高強度預應力鋼棒。bottom chord stress更多例句词组短语短語bottom m chord stress 下弦杆應力bottom chord stress更多词组专业释义土木建築工程下弦杆應力