原级：quadruple
现在分词：quadrupling
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过去分词：quadrupled
过去式：quadrupled
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1. 四元组：quadrant 象限 | quadruples 四元组 | qualification 限定;资格;合格
1. Even if China's economy quadruples, the average Chinese will remain poor.
2. China plans to double its energy consumption as its economy quadruples by 2020, officials say.