mower knife grinder

例句：

1. 1. The mower knife grinder is essential for maintaining the sharpness of our lawn mower blades.
   割草机刀磨刀器对于保持草坪割草机的锋利至关重要。
2. 2. After using the mower knife grinder, we can see that the blades are now very sharp.
   使用割草机刀磨刀器后，我们可以看到刀片现在非常锋利。
3. 3.We recommend using the mower knife grinder regularly to ensure the longevity of our lawn mower blades.
   我们建议定期使用割草机刀磨刀器，以确保我们的草坪割草机刀片的持久性。