Engineering. A rigid structural frame consisting essentially of two uprights connected at the top by a third member; (originally) such a frame…
| 单词 | θ209633 |
| 释义 | society > occupation and work > industry > building or constructing > building or providing with specific parts > specific parts built or constructed > [noun] > framework > rigid structural frame (3) portal1876 Engineering. A rigid structural frame consisting essentially of two uprights connected at the top by a third member; (originally) such a frame… portal bracing1881 = sense 1f; (also) the technique or practice of using portal frames to give strength and stability. portal frame1908 = sense 1f. |
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