单词：holomorphic principal fiber bundle
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Beginning with the earliest pioneers, Americans have always highly valued their freedoms, and fought hard to protect them. And yet, the author points out that there is a basic freedom which Americans are in danger of losing. What is this endangered
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090 A Bundle of Sticks There once lived three greedy brothers in a town. Everyday, three brothers fought to get more things. One day, their father called them out to reason with them, Sons, stop fighting with each other. However, they still remained
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Online communication tools played a huge role in recent government changes in Tunisia and Egypt. But they also showed how easily governments can interrupt Internet traffic and cell phone transmissions. VOA's David Byrd has this look at the future of
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我们上次讲了几个以nerve这个词为主的习惯用语。Get up the nerve或者work up the nerve，它们解释鼓起勇气去做艰难甚至危险的事情。我们还学了have got a lot of nerve和of all the nerve这两个习惯用语都用来
美国习惯用语
The next morning Lily:Morning, Mom. [coughs and sniffles] Mom:I made a doctor's appointment for you. Lily:No, I'm fine. I don't need to see a doctor. Mom:Then I guess you're healthy enough to clean your room before school. Lily:OK. I'll go see the do
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A man once had four sons who never stopped quarrelling withone another．He was always telling them how much easier life wouldbe if they worked together but they took absolutely no notice of him．One day he decided to show them what he meant．He ca
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