翻译下面一段话
Joan Green likes to use her head.She often asks questions at school and at home.Some of them are hard for her father to answer. Mr Green often borrows some books from the library and reads them after work.
Lunch begins and Mrs.Green asks their friends to sits at the table.Joan sees the aggs on the plate and says,“I don't think you're right,today.”
"But why?"her father asks in surprise."A hen has an egg,but an egg doesn't eat anything!"
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