Listening comprehension is the key to the command of any foreign language. That '; s one of the reasons why it '; s so difficult to learn on your own.
听力是掌握任何一门外语的关键，这也是它为什么自学起来如此困难之原因所在。
It 's so difficult a question that none of us can answer it.
那是一个很难的问题，我们没有一个人能回答。
It 's so difficult a question that none of us can answer it.
那是一个很难的问题，我们没有一个人能回答。
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