One hundred percent commitment to your studies, though it can be lonely and no fun at all, will leave precious marks on your youth.

百分百投入到学习中去，尽管会既孤独又无趣，但这会在你的青春里留下宝贵的印记。

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Article 9. No unit or individual shall produce false copies or make fraudulent use of special postal marks, postal uniforms and special postal articles.

第九条任何单位或者个人不得伪造或者冒用邮政专用标志、邮政标志服和邮政专用品。

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The only condition is that they should have no paint and oil spots and burning marks.

唯一的一个条件是：这些轮胎没有任何涂染、油污以及燃烧的痕迹。

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"The type of attack I suffered doesn't leave any marks and there is no residual damage, " he added.

BBC: RELATED BBC SITES

Mr Kelly told reporters after inspecting it that a length of rope was looped around the piece of steel and that no marks were visible on the walls overhead.

BBC: 'Part of 9/11 plane landing gear' found in New York

Defence lawyer Mark Stewart told Dr Mayo Garcia that another doctor had examined the baby when she was admitted and had found no marks on the child.

BBC: Baby needed 'huge amount' of sugar, trial hears