... matrix calculus 矩阵计算 calculus removed 结石排除, 结石移除... vector calculus 矢量计算,矢算,矢量...
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Plaque needs to be removed through a daily oral care routine which includes brushing and flossing or the plaque will harden into tartar (or calculus).
牌匾需要通过日常的口腔护理，其中包括日常刷牙和使用牙线或斑块会成为牙结石硬化（或演算删除）。
The calculus and stains have to be removed before your gums can become healthy.
牙石和污垢得先清除掉，然后牙龈才会变得健康。
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