一座小山村，藏着发展的大逻辑。
With rare exceptions, phones are pretty boring these days. The good news is, a boatload of those rare exceptions are about to show up at once, courtesy of Mobile World Congress.
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This was Collins's last flight. She tells us that she always planned to stop after her fourth mission - to give others a chance to go to space.
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It was one of the greatest understatements of all time. The crew were in big trouble - a dramatic explosion had disabled their craft.