This query starts at a context element and follows all trace relationships in the reverse direction to discover all elements in lower levels of abstraction.

这个查询是从一个上下文元素开始的，并遵照相反方向的跟踪关系从而发现更低抽象层的同一水平的元素。

youdao

A total of 485 zircons held inclusions, and about a dozen or so of these contained radioactive trace elements that allowed the researchers to determine their ages.

总共有485块锆石内部带有包体，其中有十几块包体中含有放射性微量元素，研究者可以根据它们来测定包体的年代。

youdao

Figure 1 shows an example of an EMF model created for the DB2 trace file elements that you need to search for a resource leak.

图1显示了为DB 2跟踪文件元素创建的emf模型的一个示例，它可以帮助发现资源泄漏。

youdao

"I suppose if you lay in a bath filled with mineral salts and trace elements some small part of that will be absorbed through your skin, " he says.

FORBES: Water, Water Everywhere

Even if the trace elements of PCBs that can be found in Hudson River fish posed a danger to humans, the EPA's solution is ill-conceived.

FORBES: Fact and Comment

They are concentrating on a study of stable isotopes - atoms of the same type but with different masses - and trace elements in the birds' feathers.

BBC: Feathers clue to warbler's travels