单词：lower critical solution temperature (lcst)
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This is the VOA Special English Development Report. Before refrigerators, homes usually had ice boxes. But another way to keep food cool without the need for electricity is to use an evaporative cooler. This is easy to make and does not even use ice.
VOA慢速英语2007年（二）月
This is the VOA Special English Development Report. Indonesian women sell their harvest in a traditional floating market Before refrigerators were invented, the next best thing was an ice box. But another way to keep food fresh is to use an evaporat
VOA慢速英语2009年（十一）月
How Does Ice Cool Drinks? Heres something we tend to take for granted: drop a few ice cubes into a glass of water at room temperature, and in a few minutes the water will cool. How does this work? Heat is a measure of molecular activity: the faster a
英语听力文摘 English Digest
Why Are Nights More Calm Compared To The Day? More often than not, the wind dies down at night after a blustery day. Where does the wind go? Why are nights generally more calm than days? The difference between calm nights and windy days is the sun. D
英语听力文摘 English Digest
Cooking Under Pressure When you boil potatoes on the stove top, it can take half an hour to cook them til tender. But, when you boil them in a pressure cooker, instead presto, theyre ready in about five minutes. Whats the difference? What makes press
英语听力文摘 English Digest
Why refrigerators hum? Why refrigerators hum，on toay's moment of science.On the recent program we have discussed how fluorocarboncoolant cools your food by coming to a boil in coils hidden in your fridge. How is this possible? When you boil water o
英语听力文摘 English Digest
SCIENCE IN THE NEWS -May 21, 2002: First electronically controlled animals / Study of mothers and their sons / Effects of global warming Broadcast: VOICE ONE: This is Sarah Long. VOICE TWO: And this i
科技之光
Body Temperature 体温 Our body temperature is usually 36.5 degrees. 我们的体温通常是36.5摄氏度。 When we are sick, our body temperature goes up. 当我们生病时，体温会升高。 Sometimes, a high fever is very dangerous. 有时，高
与美国小学生一起学英文第3册
Mars 火星 Mars is a planet. 火星是行星。 It is next to the Earth. 它紧邻地球。 Its size is about one fourth of the Earth. 它约有四分之一个地球大。 Mars is not far from the Earth, but the environment is very different. 火星离
与美国小学生一起学英文第5册
How to build an evaporative cooler. Also, how to prepare fruits and vegetables for cold storage. Transcript of radio broadcast: 08 June 2008 This is the VOA Special English Development Report. Before refrigerators, homes usually had ice boxes. But a
VOA慢速英语2008年（六）月
Lesson 124 Seem 1.I seem to have caught a cold. 2.It seems that it is going to rain. 3.They seemed to be talking about me. 4.It seems that best solution. 5.His temperature seems to be all right. 6.Tome seems quite happy. 7.I can't seem to stop coughi
辛沛沛NO-BOOK 辛沛沛口语初级版
ROBERT SIEGEL, HOST: Neil Gorsuch took his seat on the nation's highest court today. He quickly proved himself to be an active, persistent questioner. NPR legal affairs correspondent Nina Totenberg reports. NINA TOTENBERG, BYLINE: Gorsuch emerged fro
2017年NPR美国国家公共电台4月
Fish live in water, but do they drink it? The answer is yes, but how fish drink water depends on where they live. Water gets into a fish's body through osmosis, the process in which water diffuses from a higher to a lower concentration. For example,
英语听力文摘 English Digest
Thermometers just tell you the temperature. Thermostats need to do more than that. In addition to reading the air temperature, thermostats also turn your furnace on if the air gets too cool, and turn it off again when the air heats up. How do they do
英语听力文摘 English Digest
A person suffering from Alzheimer's gradually loses touch with reality. It is one of the most dreaded diseases of aging. When you think about the functions that limit living independently and autonomously, loss of cognition is one of the major ones,
VOA标准英语2010年(三月)
Whats a Fly Doing in Antarctica ? 南极有苍蝇？ Sometimes the biggest finds are the smallest finds. Researchers examining a segment of siltstone taken from ground along the Beardmore glacier in Antarctica found something unexpected. They found a
英语听力文摘 English Digest
Ocean Heat 海洋热量 Ya?l: I hear a lot about global warming, but how do scientists take the Earths temperature? Don: Great question. Most of the excess heat trapped by greenhouse gasses like carbon dioxide ends up in the oceans.Thats because the
英语听力文摘 English Digest
It's a common enough sound in summer, after the wind finally picks up on a hot and humid afternoon, as the rain starts spattering down in big, fat drops--you're in for a full-blown thunderstorm. It's much less common in winter, even during a snow sto
英语听力文摘 English Digest
Cold Feet and Hot Wings 鸟通常只在休息或睡觉的时候才单脚站立。鸟类学家认为，他们这么做是为了减少能量的消耗，并把一只脚收到翅膀之下休息，通常他们会交替使用两只脚独立。披着一身羽
英语听力文摘 English Digest
Skinny Legs and All Why do horses have skinny legs? Find out on this Moment of Science. Why do horses have skinny legs? Okay, they arent entirely skinny its mostly the (1)bottom half, with a big muscle up at the top.Thats odd. Human legs are kind of
英语听力文摘 English Digest