尸t + Re M Ox +,) ax Ox O(1)+O(1)= ,2O(1)+ Re[O(1)+O(,)] 1 [ (1) ( Re 1 (1) 1 (1) (1) 2 2   O O O M O O + + + =   )] ' ' ' [ ( ' Re ' 1 ' ' ' ' ' ' ' ' ' 2 x u x v x y p M y u v x u u   +     +  −  =   +        