major structure的用法和样例：
例句
- The station's structures are built by cypresses of Alishan and black tiles of Japan.The main structure doesn't use any nail but mortise to build it.
车站建筑采阿里山桧木，以及来自日本的黑瓦营建而成，主结构完全不使用铁钉，以榫接方式建造而成。 - An algorithm of correlative coefficients, between any two nodes of filiation or fraternal relationship of extended product main structure, was presented.
提出了扩展的产品主结构中各个父节点与其子节点之间，以及同级的各个兄弟节点相互之间的关联系数计算方法。
