聚煤作用发生在特定的演化阶段。
The coal accumulation process took place during their certain periods.
在板块构造不同演化阶段，形成的矿床组合也各不相同；
During the different evolutionary phase of the plate tectonition, there were different deposit associations.
分子外流标志着恒星形成早期演化的一个重要阶段。
Molecular outflows mark an important phase in the early evolution of star formation.
双子叶植物在演化的早期阶段就已分化为两大支派。
The dicotyledons diverged at an early stage of their evolution into two main groups.
煤演化程度处于成熟—过成熟阶段。
The coal evolution is in stage of maturity to over-maturity.
烃源岩热演化程度高，已进入了过成熟阶段。
The thermal evolution degree is high and has entered over-maturation phase.
研究区的地幔铅具有单阶段演化历史；
研究区的地幔铅具有单阶段演化历史；
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