Image credit: Left, photo courtesy of the author; right, photo by Stephen voss.

图片来源：左为作者自拍照；右为斯蒂芬·沃斯拍摄。

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Image credit: Left, photo courtesy of the author; right, photo by Stephen voss.

图片来源：左为作者自拍照；右为斯蒂芬·沃斯拍摄。

youdao