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電磁場的方程是從實驗事實中推導出來的。

The Moving Finger writes; and, having writ, Moves on: nor all thy Piety nor Wit Shall lure it back to cancel half a Line, Nor all thy Tears wash out a Word of it.

The line between madness and genius is drawn by those who fear both.

信仰是在你看不見整段樓梯時就踏出第一步。