to wear away

• 不可磨灭的功绩

  indelible achievement

• 不可磨灭的贡献

  indelible contribution

• 留下了不可磨灭的印象

  left an enduring impression

• 年深月久，碑文已经磨灭了。

  The inscription on the tablet has been worn away with the passage of time.