语 境 自 主 领 悟
先观察原句
后自主感悟
1.The Great Wall of China is the longest manmade structure (which was)ever built in the world.
2.The Three Gorges Dam，which is the biggest construction project in China since the building of the Great Wall and the Grand Canal，has been built to control flooding and provide hydroelectric power for the central region of China.
3.Sun Yatsen，who was the leader of the 1911 Revolution，first suggested the idea of a dam across the Yangtze River in 1919.
1.2、3句中，关系词前面均有逗号，它们为非限制性定语从句。
2.1句中的定语从句可转换为过去分词短语。
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