关键字with可以自动管理资源，不论因为什么（哪怕是代码引发了异常）跳出with块，总能保证文件被正确关闭。

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• A differentiation strategy focuses on providing a product or a service with（）attributes， in comparison with the competition， to
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• 关键字with可以自动管理资源，代码引发了异常也能跳出with块，可以保证文件被正确关闭。
• At the end of the year， he would return to China with happy memories of his experience on Boston and his students there — with a