水绝缘

VOA慢速英语2011--How to Make Your Own Solar Water Heater

Technology Report - How to Make Your Own Solar Water Heater This is the VOA Special English Technology Report. Solar water heaters are used around the world and are not very difficult to build. The system we are going to describe is based on a design

发表于:2018-12-16 / 阅读(59) / 评论(0)

2011年VOA慢速英语(四)月

Take Away English-Green Living 绿色生活

Can we help the environment by being green? We all know that humans are damaging the environment, but what can we do about it? Some people are trying to do their bit to try to be more environmentally friendly . Local councils in Britain encourage ce

发表于:2019-01-02 / 阅读(54) / 评论(0)

Take Away English

DEVELOPMENT REPORT – How to Make a Solar Water Heater

DEVELOPMENT REPORT – How to Make a Solar Water Heater By Gary Garriott Broadcast: Monday, November 29, 2004 I'm Gwen Outen with the VOA Special English Development Report. Solar water heaters save o

发表于:2019-01-02 / 阅读(60) / 评论(0)

农业与发展

美联社新闻一分钟 AP 2014-08-07

1. A temporary cease fire declared by Israel slowed violence in the Gaza war Monday, with Hamas Rocket fire tapering off, and with Israels ground operations in Gaza winding down, the fighting appears to be easing. 2. The Mayor of Toledo, Ohio has lif

发表于:2019-01-11 / 阅读(77) / 评论(0)

美联社新闻一分钟2014(八)月

VOA慢速英语 Development Report - Making a Solar Water Heater

This is the VOA Special English Development Report. Solar water heaters are devices that use energy from the sun to heat water. Solar water heating is used around the world. An example of a rooftop solar water heater being built in South Africa The

发表于:2019-01-11 / 阅读(62) / 评论(0)

VOA慢速英语2009年（四）月

科学美国人60秒 SSS Future Wet Suits Otter Be Warmer

Whales, seals and walruses stay warm in chilly water because they have a thick layer of blubber. We humans rely on something like blubberneoprene rubber wet suitsto spend time in cold water. But the thick versions for really icy water are heavy and u

发表于:2019-01-17 / 阅读(48) / 评论(0)

2016年Scientific American(十)月

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-a

acrylamides

adrenal arteriography

aesthetic unit of face