Laboratory tests by ELISA method of serum samples for this and 50 other contact were found to be negative.

采用ELISA法对该人及50名其他接触者的血清样本进行的实验室检测均呈阴性。

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A close relationship inevitably generates both positive and negative emotions. Where there is contact, there is friction.

亲密的关系不可避免会同时产生正面的和负面的情绪。有接触的地方就会有磨擦。

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Please DO not leave us negative feedback. If you are not satisfied in any regard, please contact us for solution.

请不要给我们负面的评价。若是您有任何不满意的地方，在评价前请与我们协商解决的方案。

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She said reducing contact time would have a negative impact.

BBC: Teacher of the deaf

He realized that when he was uncertain about a topic he was discussing, "instinctively I wouldn't make eye contact, and that comes across as a negative, " he says.

WSJ: The Decline of Eye Contact

He is restricted to a special "negative pressure" room that traps and cleanses air particles, and medical staff will wear masks when in contact with him.

BBC: Andrew Speaker conducted the interview wearing a mask