卫星图片为我们捕捉了一些破坏前后的对比图。
Some of this destruction has been captured in before and after satellite photos.
应该为用户提供可以进行相关变量和趋势的对比手段，或者是事件前后的对比手段。
You should provide a means for users to compare related variables and trends or to compare before-and-after scenarios.
方法：回顾性分析84例分泌性中耳炎患儿的临床资料及其相关因素，并收集资料完整的22例做治疗前后的对比。
Methods: Clinic information and related factors of 84 cases of SOM were retrospectively analyzed. And 22 cases with complete data were compared.
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