concrete box的用法和樣例：
例句
- The successful alternative was the cast-in-place segmental prestressed concrete box girder.
最后采用的方案是分段現澆的預應力混凝土箱形梁。 - Binzhou Yellow River Bridge is a three-tower cable-stayed bridge with prestressed concrete girders.
摘要濱州黃河大橋主橋是三塔預應力混凝土斜拉橋，主梁為預應力混凝土箱梁。
