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大眼貓頭鷹
說
11 years ago
數學界 的 莎士比亞 ~
Leonhard Euler honoured by Google doodle
大眼貓頭鷹
說
11 years ago
尤拉大師 ~ 306 歲 誕辰 !!
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Leonhard Euler honoured by Google doodle Leonhard Euler honoured by Google doodle 
Leonhard Euler honoured by Google doodle