This product has no defect at all.
这个产品没有缺陷。
The crux of the matter is that no phone was defect-free.
问题的症结是，没有手机是无缺陷。
The surface should be smooth and no-defect without obvious scratch lines.
表面应光滑，无缺料、无明显划线。
The surface should be smooth and no-defect without obvious scratch lines.
表面应光滑，无缺料、无明显划线。
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