Just as nobody could have predicted the impact of the steam engine in 1750-or the printing press in 1450, or the transistor in 1950-it is impossible to foresee the long-term impact of 3d printing.
正如1750年没有人能够预测蒸汽机的影响，或者1450年的人们之于活字印刷术，还有1950年的人们之于晶体管，现在的人们也难以预知3d印制技术的长期影响。
The reason that certain things seem impossible is simply because nobody has achieved them yet.
有些事看起来不可能，仅仅是因为还没有任何人做成功过。
The reason certain things seem impossible is simply because nobody has achieved them yet.
某件事情看上去不太可能的原因只是因为现在还没有人做到罢了。
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