It always seems impossible until it's done.

The first step in the art of cutting metals is to find a man who has the necessary skill and experience.

勇气不是没有恐惧，而是继续前进的意志。

The challenge in science is not just to find answers but to understand their deeper implications.

最大的荣耀不在于永不跌倒，而在于每次跌倒后都能站起来。