three times和a third 后接 the size of B比较

of 分两种情况。China's economy is still less than a third the size of America's at market exchange-rates.这里 a third 后无 of , 表示1/3 倍。这是一句经济学人的例句。如要表达中国经济体量为世界的 1/3 ，可用A is a thrid of the size of B.   含有从属关系

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