There is also something else you will need to make the solar water heater work -- the sun.

VOA: special.2009.04.20

The heater is on, it's producing heat until a negative signal is registered, 'oh we've gone too high', and then it turns off.

加热器会开着,一直产生热量直到它得到一个关闭的信号,噢我们弄得太热了,然后就关闭了

耶鲁公开课 - 生物医学工程探索课程节选

It works by a control mechanism called negative feedback, and the thermostat is measuring the temperature and then sending a signal to a heater somewhere.

是通过一种叫做负反馈的控制机制,探测器测量温度,再把信号传给加热器

耶鲁公开课 - 生物医学工程探索课程节选

The solar water heater described here is based on a design developed some years ago in Afghanistan.

VOA: special.2009.04.20

This is my friend, long-time colleague, music librarian extraordinaire and professional French horn player, Eva Heater, who will demonstrate here-- Come on over here right in the center.

这位是我的朋友,长期共事的同事,音乐图书管理员,了不起的专业法国圆号手,伊娃·夕瑟,她将在此演奏,过来,站到中间来

耶鲁公开课 - 聆听音乐课程节选

Engineers had to boil off the remaining oxygen by turning on a heater in the tank.

VOA: special.2009.07.22

Eva Heater, come on up.

伊娃·夕瑟,请上来

耶鲁公开课 - 聆听音乐课程节选

The second part of the solar water heater holds the water for the system.

VOA: special.2009.04.20

As you might expect, the heater will heat water only on sunny days.

VOA: special.2009.04.20

This solar water heater is easy to build and operate.

VOA: special.2011.04.25

There are two parts to the solar water heater.

VOA: special.2009.04.20