Identify the Origin of each term in Weizsäcker's Semi-Empirical Mass formula?

I was hoping someone could explain each term in Weizsäcker’s semi-empirical mass formula in simple English because I don’t understand it. Any help will be appreciated thank you.

$$M_{Z,A} = ZM_{H} + (A-Z)m_{N} – aA + bA^{2/3} + cZ(Z-1)A^{-1/3} + d(N-Z)^2 A^{-1} pm delta(A,Z)$$