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问题: how much of

After years of experimentation,AIS and the
University of Newcastle in New South Wales
developed a test that measures how much of the immune-system protein immunoglobulin A is
present in athletes's saliva.
怎么要多用一个OF呢 我觉得不需要OF就可以呀

解答:

that measures how much of the immune-system protein immunoglobulin A is 词序改一下,就清楚了:
that measures how much immunoglobulin A of the immune-system protein is
在免疫系统蛋白质中有多少的A型免疫血球素。OF不多不少吧!


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