tartar n. 牙垢；牙结石；[化]酒石。stain n. 污点；瑕疵；着色剂；染料。
as is照现在的样子（指不再作修理或改进）。
【例句】
I have a lot of tartar on my teeth.
我的牙齿上有许多牙垢。
I shall try, with as much patience as is possible, to explain yet again.
我会尽可能耐心地试着再解释一遍。
【例句】
I have a lot of tartar on my teeth.
我的牙齿上有许多牙垢。
I shall try, with as much patience as is possible, to explain yet again.
我会尽可能耐心地试着再解释一遍。
