牙石

Calculus — If left alone long enough, plaque begins to mineralize and harden into calculus or tartar because the plaque absorbs calcium, phosphorus and other minerals from saliva.

牙结石—如果菌斑呆的时间足够长，它就开始矿化变硬形成牙石或牙垢，因为菌斑从唾液中吸收了钙，磷和其他矿物质。

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Nice! We buy a hamster feed, hamster mat, hamster, so afraid of water of bath sand with monopoly?... But the hamster molar stone not sold, I didn't buy it.

好漂亮的！我们买了什么仓鼠饲料啊，仓鼠垫料啊，仓鼠怕水，所以要用专卖的浴砂啊……惟独仓鼠的磨牙石没卖了，我才没买。

They remove them with a special instrument or an ultrasonic scaler.

他们用一种特殊的器具或超声波洁牙器来除去牙垢和牙石。

The odontolith is the hard calcified or calcifying lump which is mainly formed by dental plaque .

牙石是附在牙面上的钙化或正在钙化的牙菌班为基质的团块。

Waterway near Lighthouse extraoral calculus for three anti-clockwise rotating flow, and the rest throughout the flight paths are basically the same as with the reciprocating flow.

航道口外三牙石灯塔附近为逆时针回转流，其余各处均为与航道基本一致的往复流。

GALP is the Portuguese oil company which last week lost the oil-gas contract with the government of East Timor.

GALP是一间葡萄牙石油公司，上星期没得到与东帝汶政府间的油气开采契约，而是作为奖励被意大利的ENI拿到；总理阿尔卡蒂称此契约为首次开采帝汶海中丰富蕴藏油气的行动。

Let me have a look There are a lot of dental calculus and odontolith on your teeth .

hellip；在您的牙齿上有很多牙垢和牙石。

P: What are dental calculus and odontolith?

病人：什么是牙垢和牙石？

P: Can we prevent dental calculus and odontolith?

病人：牙垢和牙石可以预防吗？

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。