... 中块石圬工：cobble stone masonry 中跨挠度：midspan deflection 中跨距(中心跨距)：central span ...
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excessive deflection in the midspan 跨中下挠
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However, box girder cracking and long-term midspan deflection are the defects which commonly exist in the long-span prestressed concrete box girder bridge.
但箱梁开裂与跨中下挠是目前大跨预应力混凝土箱梁桥中普遍存在的病害。
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