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.
更大高度要求增加柱和梁的尺寸以使建筑物更加坚固，在风荷载作用下建筑物才不会产生超过一个可接受限度的摆动。
Greater height entails increased column and beam sizes to make buildings more rigid so that under wind load they will not sway beyond an acceptable limit.
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