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to phrases
top chord
bridg.constr. 上弦
hydroel.st. 上弦杆
railw. 上弦梁; 货车上侧梁
tech. 顶弦; 屋架的上弦杆; 人字木
top chord: 27 phrases in 5 subjects
Architecture2
Bridge construction2
Construction2
Rail transport3
Technology18