知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 “A one that by no means made a error never experimented with nearly anything new.” – Albert Einstein “Shoot with the moon. Even if you miss out on, you can expect to land Amongst the stars.” – Norman Vincent Peale “Your time and effort is limited, Do https://diigo.com/010qd0p