sentence1: the construction of solitons , and the study of the scattering properties of solitons of the ward equation have been studied intensively by solving the degenerated riemann-hilbert problem and studying the limiting method .
sentence2: the construction of solitons , the study of the scattering properties of solitons , and darboux transformation of the ward equation have been studied intensively by solving the degenerated riemann-hilbert problem and studying the limiting method .