依旧是这样，直到星期五前，我们还以为我们的国家是一块纯洁之地-----从未被社会的败坏玷污过。
Still, until Friday, we thought of our country as a virgin — unsullied by the ills of society.
结果表明五倍子有去除玷污层的作用，且不会过度侵蚀牙本质小管；
The results showed that aqueous extract from Chinese nutgall can remove the smear layer without enlarged orifices.
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