ink mileage

例句：

1. 1. The printer uses ink to print documents.
   打印机使用墨水来打印文档。
2. 2. Ink is a liquid that is used for writing and printing.
   墨水是一种用于书写和印刷的液体。
3. 3. The ink on the pen has faded over time.
   这支钢笔上的墨水已经褪色了。