Many of the plants and animals from which our food comes can produce themselves quite well without our help. Fish, for example, live and breed according to their own life pattern. Human "producers" then come with nets and fishing poles to take the fish from the water.
In our specialized world, however, it is not always possible to let our food grow in its own way. A relatively small number of people are responsible for producing large quantities of food. In order to perform such a function effectively, it is necessary for them to raise cattle and grow crops in a fairly concentrated area.
Fishing, livestock(家畜)breeding, and fruit, vegetable, and grain growing are among the more commonly known food-production industries.
參考答案：
作為我們食物來源的許多動物和植物，無需人的幫助也能自行繁殖。例如魚按照自己生活方式生長和繁殖，所謂人類"生產者"只是用漁網和漁桿將魚從水中捕撈上來而已。
但是在我們這個專業化了的世界里，我們不可能總讓食物以自己的方式自然增長。較少數量的人力要負責生產大量的食物。為了有成效地履行這一職責，他們有必要在相當密集的地區飼養家畜和種植農作物。
養魚，飼養家畜以及種植水果、蔬菜和糧食都是人們更普遍熟悉的食品生產業中的一部分。
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（責任編輯：vstara）
