Additional epidemiological, environmental and food trace-back investigations are under way.

其它的流行病学、环境和食品反向追踪调查正在进行中。

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Like a family tree that you might use to trace back through generations of ancestors, only it's showing a family of genetically related languages instead of people.

就像你可以追溯祖先的家谱一样，它只是在显示与遗传相关的语言，而不是人类。

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Rather than merely a sign, it is the root from which we can trace back to our ancestor, the tie that helps bind us to other members of the same clan, the dignity most people hope to live for.

它不仅仅是一种标志，更是我们可以追溯到祖先的根源，是将我们与同族其他成员联系在一起的纽带，是大多数人希望为之而活的尊严。

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Another difference: After being dogged by privacy advocates, Google now anonymizes search results -- making them difficult, if not impossible, to trace back to an individual user -- after nine months.

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Many Israelis trace their roots back to Arabic-speaking countries, and this fusion is reflected in their creative cuisine.

BBC: Hunting for hummus in Israel

Friday's significance can trace its roots back to mid-April.

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