事实上，生产力的概念本身就是时钟的副产品：一旦工作表现与统一的时间单位可以联系起来，工作就永远都不一样了。

Indeed, the very notion of productivity is a by-product of the clock: once one can relate performance to uniform time units, work is never the same.

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在中世纪，一把长矛被放在骑手的臂膀下，以统一骑手和武器的力量，一旦受到冲击，持兵器者就会向后摔下马去。

In medieval times, a lance couched under the rider's arm, unifying the force of rider and weapon, would throw its wielder backwards off the horse at impact.

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一旦用户掌握了每个功能特性，就能够统一地使用它们完成对代码库的评审与修正。

Once the user masters each feature, she is able to use them all together to review and rationalize its code base.

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