This is the basic problem of evolution.
这是进化的基本问题。
Workflow instance migration is a typical and important problem in the research of workflow evolution.
工作流实例迁移是工作流演化研究中典型而重要的问题。
At present the best measure of settling the difficult problem is protein molecular evolution engineering.
而目前解决这一难题的有效方法是分子进化工程。
Stellar rotation is a difficult problem of the theory of stellar structure and evolution.
恒星的自转，是恒星结构和演化理论的难点。
Stellar rotation is a difficult problem of the theory of stellar structure and evolution.
恒星的自转，是恒星结构和演化理论的难点。
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