Hemostatic, vitamins are null and void and can not simply Xiya radical.
止血药 、 维生素都是无效的,单纯洗牙也不能根治.
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The declaration was null and void as it was proclaimed in completely illegal circumstances.
该声明无效,因为它是在完全非法的情况下宣布的。
《柯林斯高阶英汉双解学习词典》
法庭一审判决金杯汽车胜诉, 确认协议无效.
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