zài / zhège / wēifēn / fāngchéng / zhōng / yánjiūzhě / xiān / qiúchū / le / yí / ge / wěndìng / de / zhōuqījiě在这个微分方程中,研究者先求出了一个稳定的周期解。In this differential equation, the researchers first found a stable periodic solution.