However, many potential sources of error remain.

然而，许多潜在的错误来源依然存在着。

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But the researchers took care to control for such sources of error.

但研究者仔细地控制了这些误差来源。

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But the researchers took care to control for such sources of error.

但研究者仔细地控制了这些误差来源。

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