backbone of network

例句：

1. 1.The backbone of the economy is the manufacturing industry.
   经济的核心是制造业。
2. 2. The backbone of the company's success lies in its innovative products.
   公司成功的关键在于其创新产品。
3. 3. The backbone of the project is the construction of the new hospital.
   项目的核心是新医院的建设。