Girder

(noun.) a beam made usually of steel; a main support in a structure.

乔迪校对

• Iron girder bridges were also constructed, and thus the railway trains were carried across roads and narrow rivers at any required inclination, supported on flat beams of iron. 弗雷德里克·科利尔·贝克维尔. 伟大的事实.
• Practically all railroad rails, iron girders and beams for buildings, nails, etc. Edward W. Byrn. 十九世纪发明进展.
• The outer shell of the tunnel shield is composed of two- or three-ply boiler plates, and the interior is braced with a system of steel girders. 佚名. 神奇的知识之书.

手打:曼弗雷德