called 做后置定语 不加逗号 那 Originally developed for detecting air pollutants, having the ability to analyze the chemical elements in almost any substance without destroying it, a technique called proton-induced X-ray emission。 having在这里做定语，疑问：为什么不做状语，难道只能在句首才做壮语
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发表于 2010-9-29 21:56:52
