optimum leverage

例句：

1. 1. The company's decision to increase its investment in research and development was a pivotal moment for the company's growth.
   公司决定增加对研究和开发的投资，这是公司增长的一个关键时刻。
2. 2. The optimal leverage ratio is determined by the cost of capital and the risk-free rate of interest.
   最优杠杆比率由资本成本和无风险利率决定。
3. 3. In economics, the concept of optimal leverage refers to the point at which marginal benefits fromadditional investments equal marginal costs.
   在经济学中，最优杠杆的概念指的是额外投资边际收益等于边际成本的点。