然而，这也需要花费几年时间。

But this too will take several years.

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但是相同的功效，在美国——世界最大经济实体，要花费几年时间。

But a similar effort in the United States, the world's biggest economy, could take years.

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他们表示由于在新厂提高产量可能要花费几年时间，他们将遭受重创，这很不公平。

They say that they will be unfairly hit, since ramping up production in a new plant takes years.

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