利用微分方程解的几何定性理论，直接得到该方程存在有限振幅的周期波与孤立波解的存在条件。
Conditions for the existence of solutions to periodic and isolated waves of limited amplitude are directly obtained based on qualitative geometric theory for ordinary differential equations.
本文采用理论分析和符号运算相结合的方法研究有限深分层流体有限振幅内孤立波。
The finite amplitude solitary waves in stratified fluids of finite depth, in which the density varies with depth in lower layer but keeps uniform in upper layer, are investigated.
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