These joints featurecomplex shapes and sizes, high requirements, heavy weight and very difficult manufacture.
这些铸钢节点形状复杂、要求高、质量大，制作难度大。
2
Although many of the churches appear from the outside to be complex structures, they normally feature only a single storey but numerous different roof levels.
虽然许多教堂从外面看起来是复杂的结构，但它们通常只有一层，只是有许多不同的屋顶。
3
Although many of the churches appear from the outside to be complex structures, they normally feature only a single story but numerous different roof levels.