游梁-主曲轴连杆轴承 cabbage head
为了使上层公路桥面板能帮助主桁上弦杆抵抗巨大的纵向压力，正桥全部采用混凝土桥面板与钢桁梁共同作用的板桁结合梁。
In order to let the slabs help the top chords of the steel trusses resist the giant compressive forces, slab truss composite structures are used throughout the main bridge.
房子的主梁由三层线杆构成。
The main beams of the houses are formed by three tiers of poles.
对于下承式钢箱系杆拱桥来说，主梁是结构设计的关键部位。
The steel-box girder of the tie-bar arch-bridge is the key part in the structural design.
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