Different techniques have evolved for trace-metal analysis of polymers. In general, techniques come under two broad headings: destructive techniques and non-destructive techniques.

不同的聚合物技术已经进化为痕量金属分析。一般来说，技术面临两大标题：破坏性技术和非破坏性技术。

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Instead this new enzyme incorporates another trace metal, cadmium.

相反，这种新酶加入了另一种微量金属——镉。

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It will direct people to deal with Aloe correctly by studying on extraction method on the effective components and the determination of trace metal in the Aloe.

对芦荟中微量金属元素的测定及芦荟有效成分的萃取方法的研究可以为人们正确使用芦荟提供一定的指导。

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The authorities are now looking for anything that might have been part of the explosive devices - bits of metal or sharp objects that they might be able to trace back to its owner or owners.

BBC: Forensics investigators decode the Boston bombings