graduated hopper-charging

例句：

1. 1.The engineer designed a system to grade the hopper-charging of the coal mine.
   工程师设计了一个系统来分级给料煤矿。
2. 2.The process of grading the hopper-charging is crucial for ensuring the quality of the final product.
   分级给料过程对于确保最终产品的质量至关重要。
3. 3.The company has implemented a new system to improve the efficiency of its grading hopper-charging process.
   该公司已经实施了一个新的系统，以提高其分级给料过程的效率。