Please sign both copies of the contract.

请在两份合同上都签上字。

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Require the applicant to have the letters professionally translated and submit both copies with contact information.

要求申请人通过专业翻译将这些信件翻译出来，提交原件和复印件并附上联系方式。

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Party B must provide a duplicate copy of the construction designs and drawings, and both copies should be signed by both parties.

本工程由乙方进行设计，提供施工图纸一式两份，双方签字确认。

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Among families with parkin mutations, 13 had at least one member with mutations on both copies of the gene, while in 10 families affected members had a single mutated copy of parkin.

BBC: NEWS | Health | Gene 'predicts' Parkinson's onset

But the nearest-term potential for the drug will be in patients who have a rare genetic disease in which both copies of a gene that controls getting cholesterol out of the body are defective.

FORBES: Magazine Article

Only about 4, 000 cystic fibrosis patients have it in one or both of their copies of the gene that causes CF when it is defective.

FORBES: A Big And Dangerous Day For Personalized Medicine