英語翻譯
（1）No one knows for sure when advertising first started.It is possible that it grew out of the discovery that some people did certain kinds of work better than others did them.That led to the concept of specialization,which means that people would specialize,or focus,on doing one specific job.
（2）Let’s take a man we’ll call Mr.Fielder,for example.He did everything connected with farming.He planted seeds,tended the fields,and harvested and sold his crops.At the same time,he did many other jobs on the farm.However,he didn’t make the bricks for his house,cut his trees into boards,make the plows（犁）,or any of other hundreds of things a farm needs.Instead,he got them from people who specialized in doing each of those things.
（3）Suppose there was another man we shall call Mr.Plowright.Using what he knew about farming and working with iron,Mr.Plowright invented a plow that made farming easier.Mr.Plowright did not really like farming himself and wanted to specialize in making really good plows.Perhaps,he thought,other farmers will trade what they grow for one of my plows.
請(qǐng)標(biāo)準(zhǔn)翻譯第（3）段,