艺术不是奢侈品,而是必需品。
每一滴牛奶都讲述着一个奉献的故事——从农民到消费者。
The joy of chemistry is in the doing, not just the discovering.
The study of truth requires a considerable effort - which is why few are willing to undertake it out of love of knowledge - despite the fact that God has implanted a natural appetite for such knowledge in the minds of men.