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.
即使是一个瘦形梁龙，曾经被认为在活着的时候重达5.5吨，现在也减重了1.5吨。
Even a slender diplodocus, once believed to have tipped the scales at five and a half tonnes when alive, has lost a tonne and a half from its weight.
最后采用的方案是分段现浇的预应力混凝土箱形梁。
The successful alternative was the cast - in - place segmental prestressed concrete box girder.
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