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北師大版第20單元第三課教材有誤：在PIONEERS OF SCIENCE第三段最后一句中，Einstein then showed in his "theory of relativity" that not even time ,mass or length are constant----they change according to our experience of them.很明顯not的位置不對，not應(yīng)該放在are的后面。在第四段最后一句話中，。。。which proved that the universe was vastly larger than had previously been thought 。很明顯than的后面少了一個(gè)that 。在課文的最后一段中，。。。the world as we know it today would have been a completely different place .很顯然，as是定語從句的引導(dǎo)詞，指代the world,定語從句中多了一個(gè)it 。
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