求翻译：Small as it is，the pen has changed the course of history，shaped the destiny of nations，facilitated the commerce of peoples，recorded events，carried news，and done more work for mankind than all other tools or weapons In the past the pen did all the work For all writing Intended to last for any length of time was valid only if written with pen and ink The most famous letters in the world were written with a pen ;and it was with a pen that the greatest thinkers of all time wrote down their thoughts.是什么意思？

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