《行走天下》是2009年中央编译出版社出版的图书，作者是季羡林
每当物理学家们揭开大自然的一些新规律，这些知识就可用于制造各种装置，它们实现的功能让人叹为观止——例如，飞机可自由行走于天地间，广播可让千万人足不出户，遍知天下事。
When physicists puzzle out the workings of some new part of nature, that knowledge can be used to build devices that do amazing things — airplanes that fly, radios that reach millions of listeners.
你这种年青人我见不少了，懂一点武功就以为可以横行天下，其实行走江湖是一件很痛苦的事。
I've seen young men like you. You think of yourselves as invinciblewith martial arts?Being a swordsman gives you many restrictions.
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