单词:
单词: 相关文章
AMERICAN MOSAIC - In Corning New York: A House of Glass By Nancy Steinbach, Nana Demange and Shelley Gollust Broadcast: Friday, September 16, 2005 (THEME) HOST: Welcome to AMERICAN MOSAIC, in VOA Spec
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? 有件事情我们总觉得理所当然:室温下把一些冰块放入水中,
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
State Department Establishes Office for Religious Engagement WASHINGTON Secretary of State John Kerry has appointed a professor of Christian ethics as the first director of the State Departments Office of Faith-Based Community Initiatives. The new of
NOEL KING, HOST: All right. We're going to go now to Iowa. High stakes there for Democrats who will go to the polls tomorrow to pick a candidate to run against the state's Republican governor. Iowa Public Radio's Clay Masters reports the candidates a
This extra jostling pushes the atoms farther apart, causing the whole substance to slightly increase in size. If the substance cools off, its atoms stop pushing against each other so vigorously. This makes the substance shrink again. This connection