In the past 20 years, U. S. exports to China have increased by a factor of 12; while U. S. imports from China have increased almost 30-fold.

在过去20年里，美国对中国的出口增加了12倍，而美国从中国的进口则增加了近30倍。

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S. brain cancer rates have dropped slightly in the past few decades even as Americans' cell phone use rose 500-fold.

过去二三十年，尽管美国的手机使用率增长了500倍之巨，但脑癌患者比例却略有下降。

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In the past 20 years, U. S. exports to China have increased by a factor of 12; imports from China have increased more than 30-fold.

与二十年前相比，美国对中国的出口是当年的12倍，从中国的进口则增加了30倍以上。

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In the past 20 years, U. S. exports to China have increased by a factor of 12; imports from China have increased more than 30-fold.

与二十年前相比，美国对中国的出口是当年的12倍，从中国的进口则增加了30倍以上。

youdao