结果：三踝骨折可分为稳定型(12例)和非稳定型(30例)。
Results: Trimalleolar fracture was classified into stable (12 cases) and unstable (30 cases) types.
问题2：非稳定型随机漫步的连续极限，具调合井的随机漫步，具备巨大尾部的漫步，鞍点近似解。
Problem Set2: Continuum approximations of non-stationary random walks, random walk in a harmonic well, steps with fat tails, saddle-point asymptotics.
问题2：非稳定型随机漫步的连续极限，具调合井的随机漫步，具备巨大尾部的漫步，鞍点近似解。
Problem Set2: Continuum approximations of non-stationary random walks, random walk in a harmonic well, steps with fat tails, saddle-point asymptotics.
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