比較ｘ見真章

https://chemicalparadigms.wikispaces.com/Unit+2+Refraction+of+light

光走的路徑，不是最短，而是最快的，
──轉個彎，未必代表被拖延。

Sometimes we need to leave, in order to arrive.
Sometimes we must go up, to know we belong on the ground.
Sometimes we bow, to know why we should stand.
Sometimes you have to be apart to know you belong together.
Sometimes we need to see something small, to know what is great.
Sometimes to know what is right, we need to see what is wrong.
Because, sometimes you have to see, to believe.

-- National Geographic Euro Promo