In contrast, the KEY III is suitable for the treatment of soft tissue and hard tissue (enamel and bone), and in periodontology for gentle calculus removal.

相反，KEY III则适用于治疗软组织和硬组织(牙釉质和牙骨质)，在牙周病学中可轻柔地去除结石。

youdao

The hard, rough stains are calculus.

又粗又硬的着色的地方就是齿石。

youdao

If you study hard, you won't fail your calculus test.

如果你用功点，你的微积分就不会不及格。

youdao

The actuarial calculus built around that population has become increasingly hard to mask.

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