单词:strain energy release rate
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RACHEL MARTIN, HOST: It's taken years, but in 2016, wages finally started to go up. NPR's Yuki Noguchi explains. YUKI NOGUCHI, BYLINE: The Great Recession ended seven and a half years ago, and job gains have been steady since. But the greater demand
Broadcast: February 21, 2003 By George Grow This is the VOA Special English Environment Report. Everywhere, water use is increasing. Humans already use fifty-four percent of all the fresh water in riv
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
From VOA Learning English, this is the Health Lifestyle report. It is back to school time in much of the world. Calm, easy mornings are replaced with busy, hurried ones. Children wake up early and get ready for school. Many parents are also getting r
Nuclear Weapon 核武器 Do you know what the most dangerous weapon in the world is? 你知道世界上最危险的武器是什么吗? Of course, every weapon is dangerous. 当然,每种武器都很危险。 But a nuclear weapon must be the most
JUDY WOODRUFF: This month's jobs report was the first one since the government shutdown that captured some of its wider impact. It also came one day after a government report found stronger-than-expected growthin the U.S. economy just before the shut