代码重构：它没有直接甩代码，而是先思考了“设计模式”的选择（工厂模式 vs 策略模式），最终选择了适合扩展的策略模式。
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Ready for the answers? This is your last chance to turn back and solve today's puzzle before we reveal the solutions.。91视频对此有专业解读
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– Choose an an appropriate window frame style for the location, keep the view consistent to the aspect ratio, rather than creating a collage.