In addition, changes made to the construction codes in Los Angeles during the last 20 years have strengthened the city’ s buildi

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问题 In addition, changes made to the construction codes in Los Angeles during the last 20 years have strengthened the city’ s buildings and highways, making them more resistant to quakes.

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答案此外,在过去20年中对洛杉矶的建设规定所作的修改加强了该城建筑和公路的抗震能力,使其抗震性更强。

解析 句子主干....changes…have strengthened the city’s building and highways,…;madeto the construction codes是过去分词短语作后置定语修饰changes;making them more resistant toquakes是现在分词短语作伴随状语,补充说明前面的句子。
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