If you want something you've never had, you must be willing to do something you've never done.
The environment is where we all meet; where we all have a mutual interest; it is the one thing all of us share.
化學(xué)的樂(lè)趣在于看到不可見(jiàn)的東西變得可見(jiàn)。
地球上的每個(gè)人都有一個(gè)等待他的寶藏。