今年的主要趋势已经趋向太阳能热水器系统的认证评定。
This year has seen also a strong shift towards solar hot water heater system assessment and ratings.
我们将要讲述的这种太阳能热水器系统是基于几年前阿富汗开发的一种设计。
The system we are going to describe is based on a design developed some years ago in Afghanistan.
由于高昂的安装费用，客户的需求已经转向获得认可的太阳能热水器系统。
With installation costs high, the customer demand has experienced a strong shift towards having solar hot water heater systems approved.
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