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decl_storage macro syntax

decl_storage! { trait Store for Module<T: Trait> as KittyStorage { Kitties get(kitty): map T::Hash => Kitty<T::Hash, T::Balance>; What is this for use? What is Store ? is ...
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Definition of storage map for stored items

In the tutorial of learning substrate, a storage map for stored items is defined as follows, in which the symbol => appears, but this specification is not in the standard syntax of rust. How to ...
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