"The ambiguity that's in those answers is very,very difficult for humans to understand, never mind a computer to understand.
VOA: special.2011.02.28
So,just being able to pick one of those up will help our visitors understand how difficult portability was about thirty years ago."
VOA: special.2011.02.15
It was difficult for her to understand why she had married.
VOA: special.2009.06.27
He hoped he had made the country understand one thing: the great need to forget hatred and bitterness in the difficult time of re-building that would follow the war.
VOA: special.2009.12.31
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