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困難中孕育著機會。

I cannot but be astonished that Socrates， after having so often repeated to his fellow citizens that he did not pretend to any wisdom， but had been appointed by the gods to a mission of benevolence towards them， should have been condemned to death.

在數學中，提出問題的藝術必須比解決問題更有價值。

The land is our mother, the rivers our blood. We must protect her, for she is our life.