multiple sum造句

例句与造句

1. In general, this means one can find the & rho; ( x ) = 1 formulation by starting with an explicit sum ( or often a multiple sum, with one sum for each quantum number ), and then when one extends it into the continuum limit the integrand for & rho; ( x ) = 1 will have the same form as your summand.
2. It's difficult to find multiple sum in a sentence. 用multiple sum造句挺难的