a beam built up from boards; has a hollow rectangular cross section
box girder的用法和樣例:
例句
The successful alternative was the cast-in-place segmental prestressed concrete box girder. 最後採用的方案是分段現澆的預應力混凝土箱形梁。
It is provided with a telescopic bracket.The box beam at the external side of the telescopic part of the bracket is inserted into the square hole in the main beam. 其中,拖架具有可伸縮功能,是通過可伸縮部分外側的箱形梁插入貨台主梁的方孔中,選擇箱形樑上孔的位置來實現的。