high-grade energy

例句：

1. 1. This high-grade steel ismuch stronger than the standard one.
   这种高级钢材比标准钢材更坚固。
2. 2. The high-grade coffee is worth the extra expense.
   这种高级咖啡值得额外的花费。
3. 3. The high-grade diamonds are rare and valuable.
   这些高级钻石稀有且价值连城。