Here's a biography of John Muir.

这是约翰·缪尔的传记。

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Julia Muir provided valuable assistance with this article.

茱莉亚·穆尔在这篇文章中提供了有价值的帮助。

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But Muir says that would be a challenge - and an expensive one.

但是穆尔同时也说道，这将会是一个挑战，一个非常昂贵的挑战。

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But Muir says that would be a challenge - and an expensive one.

但是穆尔同时也说道，这将会是一个挑战，一个非常昂贵的挑战。

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