失去一个父母可能被视为不幸;失去两个则看起来像是粗心大意。
To find a truth that is true to me, to find an idea for which I am willing to live and die.
The historian’s task is to bring the dead to life.
创新不仅仅是技术的问题;它关乎人以及人们如何利用技术来产生影响。