单词:original research
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by Mignon Fogarty Today's topic is how to use colons. The podcast edition of this article was sponsored by GoToMeeting. With this meeting service, you can hold your meetings over the Internet and give presentations, product demos, and training sessio
[00:01.45]UNIT 4 The history of basketball [00:05.77]2 Listen and complete. [00:09.13]I really love Yao Ming. Who is he? [00:12.44]He's the famous Chinese basketball player. [00:15.43]Oh. Can you tell me something about him? [00:18.08]He is very tall
by Jason Marshall Weve now talked about three methods for calculating average values: the mean, median, and mode (affectionately known as the three Ms). So, are we done? Is that everything we could ever want to know about interpreting average values?
This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? The 2011 Nobel Prize in chemistry goes to Daniel Schechtman of the TechnionIsrael Institute of Technology in Haifa. Schechtman discovered what are called quasicrystals.
By Brian Wagner Miami 27 March 2008 The Endeavour has landed, after completing the longest space shuttle mission to the International Space Station. VOA's Brian Wagner has this report. The seven-member crew of Endeavour returned to Earth more than tw
WASHINGTON, May 27 (Xinhua) -- Two U.S. astronauts conducted the fourth and final scheduled spacewalks for space shuttle Endeavour 's STS-134 mission on Friday morning, the U.S. National Aeronautics and Space Administration (NASA) announced. The seve