high-grade corporate bonds

例句：

1. 1. The high-grade steel is usedin the construction of bridges.
   这种高级钢材用于桥梁建设。
2. 2. This product has beenhighly-rated by customers.
   该产品已获得顾客的高度认可。
3. 3. The company's high-grade products are known for their durabilityand quality.
   该公司的高质量产品以耐用性和质量而闻名。