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引导限制性定语从句，用在“such… as”, “the same …as/the same as”等结构中，常译作“像……一样的人或物”，“凡是……的人或物”。e.g He wished to be such a man as Lei Feng was.My bike is the same as yours.2. 引导非限制性定语从句，用来指代它前面的整个句子(即先行句)，意思是“这一点”。这个分句可以放在句首，句中，或句末。e.gThis elephant is like a snake, as anybody can see.As is well known, oceans cover more than 70% of the earth.若非限制性定语从句位于句首，句中或句末， 则用as来引导。e.g As we expected, he completed his task with great success. The compass was invented in China, as we know now........
