Originally developed for detecting air pollutants, a technique called proton-induced X-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it, is finding uses in medicine, archaeology, and criminology.
567. Originally developed for detecting air pollutants, a technique called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it, is finding uses in medicine, archaeology, and criminology.(A) Originally developed for detecting air pollutants, a technique called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it, (B) 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 (C) A technique originally developed for detecting air pollutants, called proton-induced x-ray emission, which can quickly analyze the chemical elements in almost any substance without destroying it, (D) A technique originally developed for detecting air pollutants, called proton-induced x-ray emission, which has the ability to analyze the chemical elements in almost any substance quickly and without destroying it, (E) A technique that was originally developed for detecting air pollutants and has the ability to analyze the chemical elements in almost any substance quickly and without destroying the substance, called proton-induced x-ray emission,
for同样可以表目的的呀 longman: for: used to say what the purpose of an object, action etc is for doing something a knife for cutting bread What did you do that for? I've bought him a watch for his birthday. the documents prepared for his defence
agreed, ecsniffer. here is an example: OG 42 ... worried about ... to increase as a result of deep cuts in the value of the dollar, has formed a group to study ways to sharpen our competitiveness.
there are a lot of such examples
my question is : when do we use 'for', and when 'to'? thanks
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发表于 2004-2-4 04:37:00
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