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Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Update 06_Declarations.md
Merge pull request #50 from mofengfly/master

基本完成06_Declarations.md