小学生英语阅读欣赏：When pigs fly 绝不可能

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Jacky wants to have a pet dog. But his dad doesn’t agree (同意). “Your mom is scared of dogs. So, you can have a pet dog…when pigs fly,” His dad says.
       
        Pigs are heavy and don’t have wings. They can never fly.
       
        when pigs fly是“不可能”的意思。所以Jacky想要养只小狗的愿望是不大可能实现了。