It doesn't really have more relevant search results; the variability is so great that it's impossible to say whether one search engine consistently performs better than another.
它实际上并没有太多的相关搜索结果，而搜索结果的可变性决定我们不可能评价出一个搜索引擎总是好于另外一个。
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。
When the car's 16-kilowatt-hour battery pack becomes depleted, the car automatically switches to a gas engine-a transition that is remarkably smooth (it's nearly impossible to discern on the road).
当这一车型的16千瓦时的电池组用尽时，它会自动切换到燃气发动机——这一转换过程非常平滑(在行驶中几乎无法察觉)。
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