The equation I want to display is too long to put in one column, so I prefer to make it in the whole two columns like the following format of equation(47)

including the two lines above and under equation (47). Thank you for your assistance.
The equation I want to display is too long to put in one column, so I prefer to make it in the whole two columns like the following format of equation(47)

including the two lines above and under equation (47). Thank you for your assistance.