He also identified an alternative model which he called the bottom-up approach.

他还发现了一个他称为自下而上的方式的模型。

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It was not until 1543 that an alternative model was put forward by Copernicus.

直到1543年，哥白尼才提出一个可替代模型。

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It was not until 1543 that an alternative model was put forward by Copernicus.

直到1543年，哥白尼才提出一个可替代模型。

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