non-negative definite quadratic estimate

例句：

1. 1.The non-negative definite quadratic estimate is crucial for the stability of the system.
   非负定二次估计对于系统的稳定性至关重要。
2. 2.The engineer used a non-negative definite quadratic estimate to optimize the design.
   工程师使用非负定二次估计来优化设计。
3. 3. The non-negative definite quadratic estimate was used to predict the performance of the new product.
   非负定二次估计被用来预测新产品的性能。