Mills used to use heavy stones to grind down the wheat into flour; now they use more modern machinery.

磨房过去使用笨重的石磨把麦磨成面粉；现在它们使用的是比较现代的机械。

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Misalignment of teeth between the upper and lower jaws can grind down the teeth and cause problems in chewing. Elsewhere, it is a cosmetic problem.

下颚间的牙齿咬合不正会磨损牙齿并造成咀嚼问题，此外，也会造成外表美观的问题。

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Misalignment of teeth between the upper and lower jaws can grind down the teeth and cause problems in chewing. Elsewhere, it is a cosmetic problem.

下颚间的牙齿咬合不正会磨损牙齿并造成咀嚼问题，此外，也会造成外表美观的问题。

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