Emulating your conversation partner's actions is a common human behavior classified as "mirroring" and has been known and studied by psychologists for years.

模仿谈话对象的动作是一种常见的人类行为，被归类为“镜像”，而心理学家对其的认知和研究已有多年。

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For laboratory work, Marburg virus has been classified as an extremely hazardous pathogen and can be handled safely only in specialized high-containment laboratories.

为了实验室工作，马尔堡病毒已被分类为一种极其有害的病原体，并且只可在专门的高级别控制实验室安全地进行处理。

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Mexico's Santa Catalina Island rattlesnake has been classified as critically endangered on the 2007 IUCN red List.

墨西哥圣塔卡特·莱那岛响尾蛇在2007受威胁物种红色名录中被列为极危动物。

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In previous years, the U.N.Children's Fund has classified Haiti as a country 'in crisis.' Since the devastating earthquake struck, UNICEF has increased its efforts to restore shattered lives and protect children and women who are among the most vulnerable victims of this disaster.

VOA: standard.2010.02.04

The case has been classified as a homicide even though Smith's body has not been located.

NPR: Missing Movie Exec's Car Found; Homicide Suspected

The fire has been classified as a six-alarm blaze for several reasons, the department said, including the search for Wilson.

CNN: Firefighter killed in Dallas blaze

The Environmental Protection Agency has classified secondhand smoke as a known human cancer-causing agent.

CNN: Study: Smoke-free laws may cut heart attack hospitalizations