这是由被安装在一起的金属杆组成的。
在都江堰，一台大型挖掘机从一大堆碎石中铲出混凝土板和扭曲的金属杆。
In Dujiangyan, a large mechanical digger scoops slabs of concrete and twisted metal rods from a massive pile of rubble.
他低下了头来缓解脖子的疼痛，眼睛停留在脚下生锈的铁链上，那铁链绕在一根金属杆上。
He looked down to relieve the pain of his neck, and stared at the rusty chain at his feet, which coiled around a metal rod.
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