它们是由坚固的十字形梁构成的骨架，中间夹着结实的材料，外面涂了层灰泥。
They were skeletons of strong criss-cross beams, with solid material between, coated with plaster.
这些因其密度而被著称为 la foret（森林）的梁，组成了横跨大教堂中心部分的十字形屋顶。
These beams, known as la foret (the forest) because of their density, formed the cross-shaped roof that ran the length of the central part of the cathedral.
在纯弯或纯剪分别作用下的工字形焊接板梁，在弹性范围内腹板屈曲时，翼缘会对腹板起约束作用。
When a welded I-section plate girder is subjected to bending or shearing, buckling of web in elastic range will be restrained by flanges.
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