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这篇文章是研究微波的,其中特别注意无线电定位问题。(with...10cation是分词复合结构,在句中作补充说明。) z4(Q.0x7
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(2)At present,about 80 different metals are known to man.But with so many metals to choose from,the question arises:which metal shall we use? lUR7zrwJ]o
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目前,人们已知的金属大约有80种。由于有这么多的金属可供选择,于是便产生了一个问题:我们将采用哪种金属呢?(with引出的复合结构用作原因状语。)