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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It is also possible to trace back from lower to higher levels of abstractions.

从低层级到高层级的抽象也是可能的。

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To find the bug, we have to trace back through the flow of control to find out where the variable was assigned and determine whether doing so was incorrect.

为了发现错误，我们必须通过控制流跟踪，以发现变量在哪里被赋值，并确定是否这么做是不正确的。

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Arthur Conan Doyle,creator of the fictional detective Sherlock Holmes, wrote about Poe's influence on other crime writers: "Each may find some little development of his own, but his main art must trace back to those admirable stories of Monsieur Dupin,so wonderful in their masterful force, their reticence,their quick dramatic point."

VOA: special.2009.02.02

Its control of each stage of production helps Smithfield to trace back any problems with pathogens and address them.

WSJ: What China Can Learn From America's Hot Dogs

In Northern Ireland there is a system that allows you to trace back to the farm and even when the produce was harvested, Elliott says.

BBC: Horsemeat scandal: How often does food fraud happen?

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.

CNN: IBM worries iPhone's Siri has loose lips