牙医建议每半年洗牙一次以清除牙结石。

The dentist recommends removing ___tartar by professional cleaning every six months.

许多鞑靼人居住在俄罗斯的鞑靼斯坦共和国。

Many ___Tartars live in the Republic of Tatarstan in Russia.

我们的数学老师是个出了名的严厉角色，学生们都很怕他。

Our math teacher is known as a real ___tartar, and all the students are afraid of him.