模仿文本： Now how would you go about creating your own sustainable food production system on top of your house? Apparently a growing number of people are doing it using aquaponics. You don't always need soil and all the necessary nutrients are supplied to plants through a water supply linked to fish in a nearby tank. Small businesses in London are catching on to the idea, supplying salads, herbs and fish to local restaurants. The BBC's Elizabeth Hotson went to see one located in a car park.

 

译文：那么要怎样在房顶上建立起你自己的可持续食品生产系统呢？显然，越来越多的人正在使用鱼菜共生系统来达到这一目的。你不一定需要土壤，因为植物所有所需的营养物质都由旁边一个连接到鱼缸的水槽来供给。伦敦的小企业逐渐开始消化这个理念，为当地餐馆提供蔬菜、香草以及鱼类。BBC记者Elizabeth Hotson走访了某停车场里的一家小企业。