疫情发生三年，那么多公司、企业、饭店等等都处于亏损状态，当然也有人在疫情期间赚了大钱。新闻报道说周黑鸭的成绩下降了90%以上，所以周黑鸭解释了这一点！
I have various ObservableC开发者_高级运维ollections of different object types.I\'d like to write a single method that will take a collection of any of these object types and return a new collection wh
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