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德国哲学家歌德曾言：理论是灰色的，实践之树常绿。
Germany philosopher Goethe Zeng Yan: Theory tree of being gloomy, putting into practice is evergreen.
youdao
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德国哲学家歌德曾言：理论是灰色的，实践之树常绿。
Germany philosopher Goethe Zeng Yan: Theory tree of being gloomy, putting into practice is evergreen.
youdao