The founder of the social association theory, Marx researched all kinds of the society association patterns widely, such as inner association, outside association and the world association.

马克思是社会交往理论的创立者，他对人类社会交往的类型即内部交往、外部交往和世界交往作了广泛研究。

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I am a social worker, a lobbyist, and a special assistant to the executive director at the National Association of Social Workers.

我是一名社会工作者，一名说客，也是美国社会工作者协会执行主任的特别助理。

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The National Association of Social Workers represents nearly 145,000 social workers across the country.

全国社会工作者协会代表了全国近14.5万名社会工作者。

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The American Social Health Association says HPV is the most common sexually transmitted virus and puts that number at 75 percent or more.

CNN: FDA panel urges HPV vaccine be given to boys

However, child protection expert, David Niven, who is the former chair of the British Association of Social Workers, said the level of sick leave came as no surprise.

BBC: Swansea Council to tackle social services sick leave

This month's meeting of the American Historical Association suggests that the social historians might be winning.

ECONOMIST: Taping for posterity