major structure的用法和樣例：
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.
車站建築采阿里山檜木，以及來自日本的黑瓦營建而成，主結構完全不使用鐵釘，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.
提出了擴展的產品主結構中各個父節點與其子節點之間，以及同級的各個兄弟節點相互之間的關聯繫數計算方法。
